JP5376835B2 - Drum can container flange mounting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for mounting a flange to the flange fixing part of a top plate firmly and surely without generating buckling in the middle part of the height of the flange barrel part in a method for mounting the flange to the flange fixing part of the top plate of a container such as a drum. <P>SOLUTION: When mounting the flange 2 to the flange fixing part 10 of the top plate 1 of the container such as the drum by performing the curling stage of the upper end part 4a of this barrel part, a portion having possibility that buckling is generated in the barrel part 4 of the flange 2 is beforehand supported by pressing from the inside with divided dies 21 for preventing buckling before curling and, by performing the curling stage of the upper end part 4a of the flange barrel part 4 in this state, the flange 2 is mounted to the flange fixing part 10 of the top plate 1 firmly and surely without generating the buckling in the middle part of the height of the flange barrel part 4. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to a mounting device of the flange of the drum, such as containers.

  In general, two large and small press-fitting flanges (fixed caps) are attached to the top plate of a container such as a drum can, and plugs (lids) are respectively attached to these flanges.

  Conventionally, in order to mount this type of flange on the top plate of a container such as a drum can, the top plate is first placed on the lower die of the press with the flange being press-fitted from below into a cylindrical opening. Next, the upper die of the press is lowered, and the upper end of the cylindrical flange of the top plate is bent and deformed in a folded shape outwardly by pressing the upper end of the flange cylindrical part from above by the curl piece. It was fastened to.

  The present inventor has previously proposed a method described in the following patent document as a method for mounting the flange of such a container such as a drum can.

In both methods described in Patent Documents 1 and 2, the flange mounting portion of a container such as a drum can can be double sealed, so that a so-called external gasket of the flange can be reliably sealed, and the conventional swelling It was intended to provide a method for mounting a flange of a container such as a drum can which does not cause a leakage of contents due to the protruding of the gasket or impair the airtightness.
Japanese Patent Publication No. 2-60415 Japanese Patent Publication No. 3-38010

  However, according to the conventional method for mounting the flange of a container such as a drum can, the upper die of the press is lowered with respect to the flange of the flange fixing portion of the top plate placed on the lower die of the press, When the upper end portion of the flange tube portion is bent and deformed and is wound around the upper end portion of the cylindrical mouth portion of the top plate, there is a problem that the center portion of the flange tube portion is buckled inward.

  When such a buckling occurs when the flange is mounted, the female threaded portion inside the flange cylindrical portion is deformed, so that the male threaded portion of the plug that is secured to the flange and the female threaded portion of the flange are poorly aligned. Or the volume of the housing part of the so-called external gasket on the outer periphery of the flange becomes larger than the specified volume, resulting in poor compression of the gasket. There has been a problem that the cause or the airtightness is lost.

The object of the present invention is to solve the above-mentioned problems of the prior art, and when attaching a flange to the flange fixing part of the top plate of a container such as a drum can, without causing buckling at the center part of the height of the flange cylinder part. The flange can be securely and securely attached to the flange fixing part of the top plate, and it has excellent airtightness without causing leakage of the contents of containers such as drums, and is extremely safe. Another object of the present invention is to provide an apparatus for attaching a flange of a container such as a drum can, which can contribute to the production of a container such as a drum can of good quality.

  As a result of intensive studies in view of the above points, the present inventor lowered the press upper die in the curling process when mounting the flange on the top plate of a container such as a drum can, and the curl piece portion of the flange cylinder In order to press the upper end of the flange from above, the bottom of the flange becomes a so-called fulcrum, and when the upper end of the flange cylinder is bent and deformed outwardly, the center part of the height of the flange cylinder is In particular, when the upper curl piece slips badly, or when the top plate part that enters this region with respect to the so-called curl region in the curl piece part or the upper end part of the flange tube part It has been found that when the volume (capacity) increases due to a manufacturing error of the top plate or the flange, the flange tube portion is more likely to buckle due to curling.

  In order to effectively prevent buckling at the center of the height of the flange tube portion that is inevitably caused when curling when mounting such a flange, the tube portion of the flange may be buckled in the curl process. Before the curl, the part with the buckling prevention split mold is supported from the inside, and in this state, the curling process is performed on the upper end of the flange tube, so that the center of the flange tube It has been found that the flange can be securely and securely attached to the flange fixing portion of the top plate without causing buckling, and the present invention has been completed.

In order to achieve the above object, the invention of claim 1 is directed to a press lower mold 20 on which a top plate 1 of a container such as a drum can is placed with the flange 2 set on a flange fixing portion 10 thereof, and a press upper die 30 having a mounting curled piece portion 31, the flop-less lower mold 20, the flange buckling preventing split mold having a tapered inner peripheral surface 21a which gradually becomes smaller in diameter toward the lower 21 Is attached to the upper die 30 of the press, and has a tapered outer peripheral surface 33a whose diameter gradually decreases downward, and is urged downward and is movable upward and downward, so that it can be moved up and down. The member 33 is attached, the top plate 1 having the flange 2 set on the press lower mold 20, and the flange buckling prevention split mold 21 inside the cylindrical portion 4 of the flange 2. Placed When the upper mold 30 is lowered, the split mold pushing member 33 is lowered, and the split mold pushing member 33 is pushed into the flange buckling prevention split mold 21 from above so that the split mold 21 is expanded. Then, the outer peripheral portion of the expanded split die 21 is brought into contact with the female screw portion 5 on the inner peripheral surface of the flange cylindrical portion 4, and in this state, the press upper die 30 is further lowered to curl the press upper die 30. The top end portion 4a of the flange portion 2 is pressed from above by the piece portion 31, and the top end portion of the cylindrical portion of the flange 2 is supported while the female thread portion 5 of the flange tube portion 4 is pressed and supported by the expanded split die 21 from the inside. In the apparatus for attaching a flange of a container such as a drum can, the portion 4a is bent outwardly in a folded shape and is wound around the upper end portion 13a of the cylindrical mouth portion 13 of the top plate 1. , Split mold accommodation A mounting substrate 25 having a split-type mounting locking projection 26 protruding upward is housed in the recess 24, and the split-type member divided into a plurality of parts is formed on the mounting substrate 25. A flange buckling prevention split mold 21 having a taper-shaped inner peripheral surface 21a, which is formed of 21b and gradually becomes smaller in the downward direction, is placed. As seen from the plane fitted on the outer periphery, the ring-shaped coil springs 23 are integrally bound together, and the locking inner protrusions 22 project inwardly at the lower ends of the split mold members 21b of the split mold 21. These locking inner projections 22 are fitted into annular recesses 27 provided at the base of the split mold mounting locking projections 26, so that each split mold member 21b The locking inner protrusion 22 is engaged with the locking protrusion 26.
Thus, the flange buckling prevention split mold 21 is held at a predetermined position in the housing recess 24 .

According to the present invention, when the flange is attached to the flange fixing portion of the top plate of the container such as a drum can, the flange fixing portion of the top plate is flanged without causing buckling at the center of the height of the flange tube portion 4. Can be installed securely, without causing leakage of the contents of containers such as drums, etc. The effect that it can contribute to is produced.

  Next, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

1 to 3 show a specific example of a flange mounting device for a container such as a drum can according to the present invention, which is shown in the order of flange mounting steps .

First, in FIG. 1, a case where the flange mounting device according to the present invention is applied to a drum can be described.

  The flange portion 3 having the polygonal outer peripheral edge 3a of the press-fitting flange 2 for the drum can is provided with a circular annular protrusion 6 that protrudes upward as viewed from the plane by pressing, so that the female thread of the annular protrusion 6 and the flange 2 is provided. A gasket accommodating gap 7 is formed between the cylindrical portion 4 having the portion 5 and a so-called external gasket 8 is fitted into the gasket accommodating gap 7.

  As the gasket 8, it is desirable to attach a gasket made of silicon rubber by lining. However, an O-ring, an annular gasket having a square cross section may be used, or a sealing that is sealed in a so-called chime portion of a drum can. -A compound may be used.

  On the other hand, the top plate 1 has a horizontal cross-sectional polygonal skirt 11 continuous from the top plate 1 at a predetermined position thereof, an annular stepped portion 12 connected so as to extend horizontally from the upper edge thereof, A flange fixing portion 10 is formed which is constituted by a cylindrical mouth portion 13 that is continuous in a rising shape from the inner edge via an inclined surface portion 14.

  The cylindrical portion 4 of the flange 2 with the gasket 8 is press-fitted from below into the inside of the cylindrical mouth portion 13 of the flange fixing portion 10 of the top plate 1 and placed on the lower die 20 of the press.

In the flange mounting device according to the present invention, the press lower mold 20 is provided with a flange buckling prevention split mold 21 having a tapered inner peripheral surface 21a whose diameter gradually decreases downward.

  That is, a split mold housing recess 24 is provided in the lower press mold 20 installed on the fixed base 29, and a mounting substrate 25 having a split mold mounting locking projection 26 protruding upward is provided in the recess 24. In this embodiment, a flange buckling prevention split mold 21 made up of, for example, 16 split mold members 21b is placed on the mounting substrate 25. Here, the flange buckling prevention split mold 21 is not limited to 16 parts but is divided into a plurality of parts such as 2, 3, 4, 6, and 8, for example. I just need it.

  The split mold 21 for preventing flange buckling divided into 16 parts is integrally bound by a coil spring 23 which is annular and small in diameter as viewed from the plane fitted on the outer periphery of these lower end portions. Each of the split mold members 21b is provided with a locking inner projection 22 in an inward protruding shape, and these locking inner projections 22 are formed as split mold mounting locking projections. 26 is fitted into an annular recess 27 provided at the base of the base 26, and the locking inner protrusion 22 of each split member 21b is engaged with the locking protrusion 26, thereby preventing flange buckling. The split mold 21 is held at a predetermined position in the housing recess 24.

  On the other hand, the press upper die 30 is provided on the lower surface of the elevator body 39. The upper press die 30 is provided with a flange cylinder top end curling piece (curling annular groove) 31 and an annular presser protrusion 32 outside thereof.

  A central portion of the press upper die 30 has a tapered outer peripheral surface 33a that gradually decreases in diameter downward, is urged downward by a large-diameter coil spring 36, and is itself movable up and down. A split-type pushing member 33 for preventing flange buckling is provided.

  The split mold pushing member 33 is held in a suspended form by a hanging shaft 34 from a support wall portion 37 provided at the center of the press upper mold 30. The hanging shaft 34 is inserted into a through hole 38 formed in the support wall portion 37 of the press upper die 30, and a hooking portion 35 is provided horizontally on the upper end portion of the hanging shaft 34 protruding above the through hole 38. The latching portion 35 is brought into contact with the upper surface of the support wall portion 37. A space portion between the lower surface of the elevator body 39 and the upper surface of the support wall portion 37 of the press upper die 30 is a space portion that accommodates the latch portion 35 and allows the latch portion 35 and the hanging shaft 34 to partially move up and down. 40 is provided.

  A large-diameter coil spring 36 fitted on the drooping shaft 34 is interposed between the upper surface of the split-type pushing member 33 and the lower surface of the support wall portion 37. As a result, the flange buckling prevention split-type push-off member 33 is itself movable up and down and is always urged downward by the elastic force of the coil spring 36.

In order to mount the flange 2 on the top plate 1 by the flange mounting device of the present invention, first, the gasket 8 is attached to the flange 2 along the flange 3 thereof, and the flange fixing portion 10 of the top plate 1 of the drum can is attached. The cylindrical portion 4 of the flange 2 with the gasket 8 is press-fitted from below and set.

  Next, as shown in FIG. 1, the top plate 1 having the set flange 2 is fitted on the lower press mold 20, and the flange buckling prevention split mold 21 is fitted inside the cylindrical portion 4 of the flange 2. Place it in the slid state. At this time, the tapered inner peripheral surface 21 a of the flange buckling prevention split mold 21 is disposed so as to correspond to the female screw portion 5 on the inner peripheral surface of the flange cylindrical portion 4.

  Next, as shown in FIG. 2, the split mold pushing member 33 is lowered together with the lowering (primary drop) of the press upper mold 30, so that the split mold pushing member 33 is placed inside the flange buckling prevention split mold 21. The split mold 21 is expanded by being pushed in from above, and the outer peripheral portion of the expanded split mold 21 is brought into contact with the female thread portion 5 on the inner peripheral surface of the flange cylinder portion 4.

  In this state, as shown in FIG. 3, the press upper die 30 is further lowered (secondary descent), and the upper end portion 4 a of the flange portion 2 is pressed from above by the curl piece 31 of the press upper die 30. The upper end portion 4a of the flange portion 2 of the flange 2 projecting upward from the upper end of the cylindrical mouth portion 13 of the top plate 1 while supporting the female screw portion 5 of the flange tube portion 4 from the inside by the expanded split mold 21. Is bent and deformed outwardly and is wound around the upper end portion 13a of the cylindrical mouth portion 13 of the top plate 1.

  In this way, the upper end 4a of the cylindrical portion 4 of the flange 2 is wound around the upper end portion 13a of the cylindrical mouth portion 13 along the inner surface of the curling piece portion 31 of the upper die 30, and at the same time, The portion between the annular step portion 12 and the inclined surface portion 14 corresponding to the corner portion of the outer peripheral lower edge of the annular protrusion 6 is pressed from above by the annular pressing protrusion 32 of the upper mold 30 along the corner portion. The outer peripheral inner surface of the annular flange 12 is placed on the upper surface of the outer peripheral edge of the flange 3 and the lower inner surface of the inclined surface 14 is formed on the annular protrusion 6 by the elastic restoring force of the top plate material at the bent portion. It is made to adhere to an upper end part, respectively.

  Here, as shown in FIG. 3, the bent portion between the annular step portion 12 and the inclined surface portion 14 of the top plate 1 that is pressed and deformed by the annular presser protrusion 32 of the upper mold 30 is an elastic plate material. Since the force to return to the inclined state before the pressure deformation is always applied by the resilience force (so-called spring pack), the inner surface of the outer peripheral edge of the annular step portion 12 on the one side of the bent portion is outside the flange portion 3. The inner surface of the lower edge of the inclined surface portion 14 is firmly pressed against the outer peripheral edge of the upper end portion of the annular protrusion 6 on the other side, so that airtightness is maintained.

  By the way, conventionally, when the flange 2 is mounted on the top plate 1 of the drum can, in the curling process, the press upper die 30 is lowered and the upper end portion 4a of the flange cylindrical portion 4 is pressed from above by the curl piece portion 31 thereof. Then, the bottom part of the flange 2 becomes a so-called fulcrum, and the upper end part 4a of the flange cylinder part 4 is bent and deformed outwardly, so that the center part of the height of the flange cylinder part 4 is almost inward. In the case of buckling. In particular, when the slip of the inner surface of the curl piece 31 of the upper mold 30 is poor, or the volume of the top plate part that enters this region with respect to the so-called curl region in the curl piece part 31 and the upper end part of the flange cylinder part 4 ( When the (capacity) increased due to the manufacturing error of the top plate or the flange, the flange tube portion 4 was more likely to buckle due to curling.

However, according to the flange mounting device of the present invention, in order to effectively prevent buckling at the center of the height of the flange tube portion 4 that occurs during curling when the flange 2 is mounted, The part of the flange 2 that is likely to buckle is supported from the inside by a buckling prevention split mold 21 before curling. In this state, the curl of the upper end 4a of the flange tubular part 4 is supported. Since the process is performed, the flange 2 can be securely and securely attached to the flange fixing portion 10 of the top plate 1 without causing buckling at the center of the height of the flange tube portion 4. is there.

Therefore, according to the flange mounting device of the present invention, for example, when the slip of the inner surface of the curl piece 31 of the upper mold 30 is bad, or also into the so-called curl area in the curl piece 31, the top plate enters this area. Even when the volume (capacity) of the upper end portion of the portion or the flange cylindrical portion 4 is increased due to a manufacturing error of the top plate or the flange, a portion where the buckling of the cylindrical portion 4 of the flange 2 may occur in the curling process. Before the curl, the curling process of the upper end portion 4a of the flange tube portion 4 is performed with the buckling prevention split mold 21 being supported from the inside, so that the flange fixing portion 10 of the top plate 1 of the drum can is flanged. When attaching 2, the flange 2 does not buckle at the center of the height of the flange cylinder part 4, and the flange 2 can be securely attached to the flange fixing part 10 of the top plate 1. It is intended.

According to the drum can produced using the top plate 1 having the flange 2 mounted by the flange mounting device of the present invention, the container can be leaked without causing leakage of the contents of the container, It is very safe and can contribute to the production of a good quality drum.

  The drum can flange mounting apparatus according to the present invention includes a drum lower plate 20 on which the top plate 1 of the drum can is placed with the flange 2 set on the flange fixing portion 10 of the drum can, and the flange, as described above. And a press upper die 30 having a curl piece 31 for attachment.

  Then, as shown in FIG. 1, a flange buckling prevention split mold 21 having a tapered inner peripheral surface 21 a that gradually decreases in diameter downward is attached to the lower press mold 20, A split buckling member 33 for preventing buckling of a flange is attached, which has a tapered outer peripheral surface 33a that gradually decreases in diameter toward the lower side, is biased downward and is movable up and down.

  The top plate 1 having the set flange 2 is placed on the lower press mold 20 in a state in which the flange buckling prevention split mold 21 is fitted inside the cylindrical portion 4 of the flange 2.

  Next, as shown in FIG. 2, the split mold push-off member 33 descends as the press upper mold 30 is lowered, and the split mold push-off member 33 is pushed into the flange buckling prevention split mold 21 from above. The split mold 21 is expanded, and the outer peripheral portion of the expanded split mold 21 is brought into contact with the female thread portion 5 on the inner peripheral surface of the flange cylindrical portion 4.

  In this state, as shown in FIG. 3, the press upper die 30 is further lowered, and the upper end 4 a of the cylindrical portion of the flange 2 is pressed from above by the curl piece portion 31 of the press upper die 30, and the expanded split While the internal thread portion 5 of the flange cylinder portion 4 is pressed and supported by the mold 21 from the inside, the upper end portion 4a of the flange portion 2 is bent and deformed outwardly so that the cylindrical mouth portion 13 of the top plate 1 is bent. It is made to be wound around the upper end portion 13a.

  According to the drum can flange mounting apparatus of the present invention, similarly, when the flange 2 is mounted on the flange fixing portion 10 of the drum can top plate 1, buckling occurs at the center of the height of the flange cylindrical portion 4. The flange 2 can be securely and securely attached to the flange fixing portion 10 of the top plate 1 without any problem.

  According to the drum can manufactured using the top plate 1 having the flange 2 mounted by the flange mounting apparatus of the drum can of the present invention, the container contents do not leak and have excellent airtightness. Therefore, it is possible to contribute to the production of a drum with high safety and good quality.

  In the above embodiment, the annular protrusion 6 of the flange 3 of the flange 2 is formed by press working, and an annular groove is formed on the back side of the flange 3 corresponding to the annular protrusion 6. However, there is a case where only the annular protrusion 6 is formed by pressing the collar portion 3 from above and the annular concave groove is not formed. Moreover, you may form the cyclic | annular protrusion 6 in the upper surface of the collar part 3 by the cutting process of another raw material not by press work.

Moreover, the internal thread part 5 is provided in the inner surface of the cylinder part 4 of the flange 2 by cutting .
If a lining gasket is used as the gasket 8, the mounting operation is very simple. Also, during the lining operation of the gasket 8, the liquid gasket material does not flow down due to the presence of the annular protrusion 6. There is an advantage that it is easy to do. Further, when a sealing compound is used as the gasket 8, there are similar advantages. The gasket 8 may of course be a normal annular gasket made of other elastomers or synthetic resins.

  Further, in the illustrated example, the flange buckling prevention split mold 21 can be freely opened and closed by a single annular coil spring 23 fitted over the lower end portion of the split mold member 21b divided into a plurality of parts (expanded / However, such a unitary bundling means that can freely open and close the split member 21b of the split mold 21 may be other means.

  Further, the split buckling member 33 for preventing flange buckling provided in the upper press die 30 is urged downward by the coil spring 36 and is itself movable up and down. As the downward urging means, it is also possible to use urging means such as a leaf spring or a hydraulic cylinder or an air cylinder. Furthermore, the vertical movement means of the split-type pushing member 33 itself is not limited to the structure shown in the figure, and vertical movement means of other structures may be used.

By the way, the apparatus for mounting a flange of a container such as a drum can according to the present invention is used when the flange is mounted on the top plate of a container such as a drum can by the method described in Japanese Patent Publication No. 2-60415 previously proposed by the present inventors. Are also applicable.

  That is, although not shown in the drawings, the method described in Japanese Patent Publication No. 2-60415 proposed by the inventor of the present inventor is circular when viewed from the plane on the flange 3 having the polygonal outer peripheral edge 3a of the flange 2 for a container such as a drum can. The upward annular protrusion 6 is provided, a gasket accommodating gap 7 is formed between the annular protrusion 6 and the cylindrical portion 4 of the flange 2, and the gasket 8 is fitted into the gasket accommodating gap 7 in the above-described manner. However, in the previously proposed method, the hem 11 having a polygonal horizontal section continuously connected to the top plate 1 of a container such as a drum can and the like are connected to extend horizontally from the upper edge thereof. The flange stepping portion 14 of the flange fixing portion 10 formed by the annular stepped portion 12 and the cylindrical mouth portion 13 connected to rise from the inner edge of the annular step portion 14 through the inclined surface portion 14 enters the gasket housing gap 7 from above. Plane Look preferably provided above the circular downward annular projection (not shown).

  Then, the flange 8 with the gasket 8 is press-fitted into the flange fixing portion 10 from below, and the upper end portion 4a of the cylindrical portion 4 of the flange 2 is wound around the upper end portion 13a of the cylindrical mouth portion 13 and the inclined surface portion 14 A downward annular protrusion (not shown) is inserted into the gasket housing gap 7 from above, and the gasket 8 is pressed from above by the downward annular protrusion, and the annular protrusion 6 has an annular shape corresponding to the corner of the outer peripheral lower edge. The portion between the step portion 12 and the inclined surface portion 14 is bent by pressing from above so as to follow the corner portion, and the outer portion of the annular step portion 12 is also bent at the bent portion by the elastic restoring force of the top plate material. The inner peripheral surface is brought into close contact with the upper surface of the outer peripheral edge of the flange 3, and the lower inner surface of the inclined surface portion 14 is brought into close contact with the upper end of the annular projection 6.

Also in the flange mounting method proposed previously by the present inventor, the upper die 30 of the press is lowered and the upper end portion 4a of the flange cylindrical portion 4 is pressed from above by the curl piece portion 31 to the outside. When bent and deformed in a folded shape and wound around the upper end portion 13a of the cylindrical mouth portion 13 of the top plate 1, the flange mounting device of the present invention causes buckling at the center portion of the flange tube portion 4 at the height. Can be effectively prevented.

  That is, in the previously proposed flange mounting method by the present inventor, as in the case of the above-described embodiment, the lower press die 20 has a tapered inner peripheral surface 21a whose diameter gradually decreases downward. A flange buckling prevention split mold 21 is provided, and the press upper mold 30 has a tapered outer peripheral surface 33a whose diameter gradually decreases in the downward direction, and is urged downward and is itself vertically movable. A split-type push-off member 33 for preventing bending is provided, and the top plate 1 having the flange 2 set on the lower press mold 20 is placed on the inner side of the cylindrical portion 4 of the flange 2 to prevent flange buckling. The mold 21 is placed in a fitted state.

  Next, the split mold push-out member 33 is lowered along with the lowering of the press upper mold 30, and the split mold push-out member 33 is pushed into the flange buckling prevention split mold 21 from above to expand the split mold 21. The crimped and expanded outer peripheral portion of the split mold 21 is brought into contact with the female screw portion 5 on the inner peripheral surface of the flange cylindrical portion 4.

  In this state, the press upper die 30 is further lowered, the upper end portion 4a of the flange portion 2 is pressed from above by the curl piece 31 of the press upper die 30, and the flange cylinder is pressed by the expanded split die 21. The upper end portion 4a of the flange portion 2 is bent and deformed outwardly while holding the female screw portion 5 of the portion 4 from the inner side, and is wound around the upper end portion 13a of the cylindrical mouth portion 13 of the top plate 1 It ’s good.

  As described above, the flange portion 2 of the drum can flange 2 is provided with the circular projecting portion 6 that is circular when viewed from above, and the gasket is accommodated between the annular projecting portion 6 and the cylindrical portion 4 of the flange 2. When the gap 7 is formed and the gasket 8 is fitted into the gasket accommodating gap 7, the gasket 8 does not protrude, so that the so-called external gasket 8 of the flange can be reliably sealed, and the contents of the swelling gasket protrude However, it is preferable that the annular projecting portion 6 that is circularly projecting upward from the plane is replaced with the flange portion of the flange 2 for the drum can. 3 may not be provided.

  Furthermore, in the above-described embodiment of the present invention, the annular presser protrusion 32 is provided on the upper press mold 30, but the annular presser protrusion 32 may not be provided on the upper press mold 30.

  This is because the polygonal outer peripheral edge 3a of the flange 3 of the drum can flange 2 is usually the larger flange 2 of the two large and small flanges 2 attached to the flange fixing portion 10 of the top plate 1 of the drum can. It has a regular octagon, and the smaller flange 2 has a regular hexagon. On the other hand, the hem part 11 having a polygonal horizontal cross section of the flange fixing part 10 connected to the top plate 1 corresponds to this, and the skirt part 11 is a regular octagon in the larger flange fixing part of the top plate 1. In the smaller flange fixing portion, the skirt portion 11 has a regular hexagonal shape.

  When the cylindrical portion 4 of the flange 2 with the gasket 8 is press-fitted into the inside of the cylindrical mouth portion 13 of the flange fixing portion 10 of the top plate 1 from the bottom, the polygonal outer peripheral edge 3a of the flange portion 3 of the flange 2 is usually provided. However, the flange fixing part 10 on the top plate 1 side is fitted into the bottom part 11 having the same horizontal cross section of the polygonal shape from the inside so as to be non-rotatable. The flange 2 is firmly attached to the flange fixing portion 10 on the top plate 1 side by being fastened to the upper end portion 13a of the cylindrical mouth portion 13. Therefore, the presser upper die 30 has an annular pressing protrusion as described above. 32 may not be provided.

Note that the flange mounting device of the present invention can be similarly applied to the same kind of container as a gallon can in addition to a drum can.

The specific example of the mounting apparatus of the flange by this invention is shown, and it is a longitudinal cross-sectional view of the state which mounted the top plate with which the flange was set on the press lower mold | type. In the same longitudinal sectional view, a state in which the flange buckling prevention split mold is expanded by the split lowering member attached thereto due to the primary lowering of the upper die of the press is shown. In the same vertical cross-sectional view, the upper end of the flange cylinder is wound while the female thread of the flange cylinder is pressed and supported from the inside by the split mold for preventing flange buckling by further expanding the upper die of the press. Indicates the state to stop.

1: top plate 2: flange 3: flange portion 3a: polygonal outer peripheral edge 4: cylindrical portion 4a: upper end portion 5: female screw portion 6: annular protrusion 7: gasket accommodating gap 8: gasket 10: flange fixing portion 11: horizontal Polygonal section hem part 12: annular step part 13: cylindrical mouth part 13a: upper end part 14: inclined surface part 20: press lower mold 21: split mold 21a for preventing flange buckling: tapered inner peripheral surface 21b: split mold member 22 : Locking inner protrusion 23: coil spring 24: receiving recess 25: mounting substrate 26: split mold mounting protrusion 27: annular recess 29: fixed base 30: press upper mold 31: curl piece ( Annular grooves for curling)
32: Annular presser protrusion 33: Split-type pushing member 33a: Tapered outer peripheral surface 34: Hanging shaft 35: Hanging portion 36: Coil spring 37: Support wall portion 38: Through hole 39: Elevator body 40: Space portion

Claims (1)

Includes top plate 1 of the drum or the like container, the lower press die 20 which is placed in a state of setting the flange 2 to the flange fixing portion 10 of this, the press upper die 30 having a flange attachment curl piece portion 31 and, the press lower mold 20, the flange buckling preventive split mold 21 having a tapered inner peripheral surface 21a which gradually becomes smaller in diameter downward is attached to the press upper mold 30 gradually downward diameter The flange buckling prevention split mold pushing member 33 having a tapered outer peripheral surface 33a which is small and urged downward and movable up and down itself is attached . top board 1 having a set flanges 2, flange buckling preventive split mold 21 to the inside of the tubular portion 4 flange 2 is mounted on encased state fitted, with drop-flop-less upper mold 30 Split die pusher 3 There drops,該割type 21 is made to expanded by being incorporated pushed from above into the interior of the split mold押開-out member 33 gaff flange buckling preventive split mold 21, the outer peripheral portion of the expansion opening the split mold 21 , Shi abut the female threaded portion 5 of the flange tubular portion 4 inner peripheral surface Merare, in this state, by further lowering the press upper die 30 is cylindrical flange 2 by Karl piece portion 31 of the press upper die 30 is pressed from the upper part upper part 4a, the while internally threaded portion 5 of the flange tubular portion 4 is supported by being pressed from the inner side by the flared split mold 21, the tubular top end portion 4a of the flange 2 is shaped folded outwardly In the apparatus for mounting a flange of a container such as a drum can which is bent and deformed to be wound around the upper end portion 13a of the cylindrical mouth portion 13 of the top plate 1 ,
The press lower mold 20 is provided with a split mold accommodating recess 24, and a mounting substrate 25 having a split mold mounting locking projection 26 protruding upward is accommodated in the recess 24, and on the mounting substrate 25, A flange buckling prevention split mold 21 having a tapered inner peripheral surface 21a, which is formed of a plurality of split mold members 21b and gradually decreases in diameter downward, is placed. 21 is integrally bound by an annular coil spring 23 as viewed from the plane fitted on the outer periphery of these lower end portions, and is connected to the lower end of each split mold member 21b of the split mold 21 by a locking inner portion. The projections 22 are provided in an inward projecting shape, and these locking inner projections 22 are fitted into an annular recess 27 provided at the base of the split mold mounting locking projection 26. The locking inner protrusion 22 of each split mold member 21b By suit relates to 26, characterized in that the flange buckling preventive split mold 21 is held in place in the accommodation recess 24, the mounting device of the flange of the drum, such as containers.

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