JPH0127806B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a sealed drum having a sealed end closure member.

Conventionally, industrial steel drums have been manufactured with at least the bottom end having a five-layer end closure.
Due to rising prices and shortages of steel, it was desirable to produce thin metal drums. However, standard five-layer end closures are often not strong, sturdy, and durable enough to withstand specific and normal use and abuse.
It did not adequately withstand required U.S. government tests such as the standard drop test.

In the past, various industrial steel drums and barrels
The prior art technique, which has been used for many years in the manufacture of containers, is to first form a cylindrical member of sheet steel that is rolled or welded or mechanically joined along its longitudinal edges. This cylindrical member was then flanged at both ends in a press or roll machine. The rigidity of this flanged cylindrical member is increased by providing two or more rolling wheels or reinforcing corrugations at required locations around the cylindrical member. The cylindrical member could be flanged at one end and beaded or rolled at the other end to form the container opening.

In what is known in the industry as a double seam device, a cylindrical member with flanged ends is assembled to a stamped flanged steel closure member at each end. This closure has circumferential corrugations or reinforcing ribs around its periphery and forms the bottom and top of the container. In containers with an opening, the bottom is formed in this way and the top is provided with a suitable cover or lid.

The object of the invention is to have optimal increased strength;
It is an object of the present invention to provide an improved method for manufacturing a thin metal drum having a seven-layer seam in which a sealant is selectively applied to any or all of the seams.

Another objective is to recondition another seam, thereby providing a bottom and/or top seam with increased strength and leak-tightness.

Another important advantage of the present invention is that it provides a technique for realigning drum end seams using stationary or portable machines used in the field of handling filled, difficult-to-handle drums. be. Thus, the method of the present invention produces an improved drum having a sealed end closure with significantly increased strength. The drum is first formed into a tubular shell that forms the drum sidewalls. An end closure member is disposed at at least one end of the outer shell, and adjacent peripheral edges of the outer shell and the end closure member form a circumferentially extending joint, and the two peripheral edges are brought into surface contact with each other and bent in a radial direction. Form a five-layer seam extending to . This five layer seam is then folded to form a highly reinforced radial seven layer seam of predetermined shape. This reinforced seam has excellent dimensions, handling and
and strength properties.

In accordance with the present invention, an improved seam for a drum end closure is provided, and a drum with an end closure having a five-ply seam on the top, bottom, or both is provided. , this five-layer seam is formed into a seven-layer seam. In the illustrated embodiment, the drum 20 includes a bottom closure 22 and a top closure 24 . The bottom closure member 22 is sealed to the drum 20 by a standard five-layer seam 25;
Similarly, the upper closure member 24 has a standard five-layer seam 26.
is sealed to the drum 20 by. A pair of conventional rolling rings 28, 30 are spaced apart along the sidewalls of the tubular shell 32 of the drum 20. drum 2
0 may be new and made of a thin metal plate, or may be already used and require readjustment.

A standard molding machine is used, but modifications are made, as described below, to convert the five-layer seam into an improved seven-layer seam. Forming machine 34 forms five-layer seams 26 to seven-layer seams on the bottom of drum 20. This molding machine has a drive rod 38 and a chuck 4.
The bottom seam device 36 has a bottom seam device 36 having a diameter of 0. Molding machine 3
The upper end of 4 has a chuck 42 to which a central drive rod 44 is connected. The chuck 42 includes a support roll 46, an angle roll 48,
It is surrounded by a flat roll 50 and a shaped roll 52.
The drive mechanisms and coupling arrangements (not shown) for these elements of machine 34 are all well known in the art.

Details of the upper end of the drum 20 are shown in FIG. 2, where the tubular shell 32 terminates at the upper end in a five-layer seam 26 which forms a connection with the closure member 24.

The drum 20 is fed into a molding machine 34. The chucks 40, 42 are actuated to locate on the bottom and top closures of the container. The thickness of both chucks is less than the bottom of the double seam. This holds the drum 20 in a vertical position, as shown in FIG.

Support roll 46 is then engaged with tubular shell 32, as shown in FIG. This holds the sidewalls of the shell 32 against the sidewalls of the closure member 24, thereby keeping the container from sagging. FIG. 6 shows this engaged state viewed from above.

As shown in FIG. 7, the angle rolls 48 are then actuated inwardly to bend the seam 26 at approximately 45 degrees relative to the longitudinal axis of the drum 20. The angle roll 48 is then retracted and the flat roll 50 advances to flatten the seam 26 against the top surface of the support roll 46, as shown in FIG.
The flat upper surface 52 of the support roll 46 has a slightly sloped inner slope 54. This is seam 2
6 to help retain its contour or shape when folded into the position of FIG. In this folded condition, the seam 26 is substantially perpendicular to the longitudinal axis of the drum 20 and extends radially outwardly to the sidewall of the drum 20.

Thereafter, support roll 46 and angle roll 4
8 is retracted and the powered roll 52 is engaged with the radially extending fold seam 26. The engagement surface 58 of the shaping roll 52 has a predetermined shape and engages the radially extending seam 26 to bring it into its final shape. 9th
As shown, when the seam 26 is contacted, the initial contact is made to apply a direct force inwardly toward the sidewall of the drum 20. Then, as shown in FIG. 10, when the forming roll 52 is brought into contact with the seam further in the direction of the drum 20, it will be vertical, i.e.
An axial force is applied to seam 26 to bend the seam downwardly. Finally, as shown in FIG. 11, the seam 26 is folded back so that it finally abuts the drum side wall adjacent to the closure surface to form a seven-layer seam 60.
The engagement surface 58 has a shape that forms a . When this final seam 60 is formed, a third upward force is applied by the bottom of the engagement surface 58 of the forming roll 52 to compress the seam 60 and form a minimum length seam; The seven-layer seam structure retains improved sealing properties and shaping.

As shown in FIG. 12, this contouring of the seven-layer reinforced seam provides a seam 60 of minimum length (height) in the final product relative to the length of the sidewalls of the drum 20. Furthermore, such a reinforced seam 60 is provided at the end 64
A long rounded sloped portion 6 from to the starting end of the flat portion 66
It has 2. This provides the maximum engagement surface to engage the floor surface as the drum 20 is rolled on the edge. By compressing the other end 68 of the seam 60 in the manner shown in FIG. 11 which forces the seam upwardly, a very tight seam is formed, with little possibility of separation between the metal layers. In this manner, the sealed drum 20 has a reinforced seam 60 with increased sealing, handling, and strength properties, and maintains the seam 60 at a desired minimum length. As mentioned above, this type of seam can be provided at both the top and bottom ends of the drum 20.

Alternatively, as shown in FIG. 13, the reinforced seam 60' can be formed in the same manner as the seam 60 of the previous embodiment, and if the container holds certain materials. by applying appropriate pressure and perhaps heat if necessary.
Seam 60' is substantially integral, further providing desirable sealing properties. The layers of this type of seven-layer seam are not easily discernible to the naked eye. This is believed to be due to metal flow of these layers resulting in a substantially adhesive mass.

An advantage of the forming machine 34 is a superior shaping roll 52 that moves horizontally to form a reinforcing seam 60. The standard five-layer end-closed drum quickly
Moreover, it can be efficiently converted into a seven-layer end-closed drum. Importantly, the engagement surface 58 of the shaping roll 52 provides a wider surface for rolling the drum, and this wider surface is distinguishable from the drum edge. When using a thin metal plate, rolling it on the edge of the drum may cause wave loss at such points. As mentioned above, the middle portion of the engagement surface 58 provides an increased gradual slope to facilitate rolling of the drum. Furthermore, the engagement surface 58 of the forming roll 52 has a predetermined slope at its bottom, which provides a camming action that presses the bead, or seam, more tightly, further increasing its strength. To increase. This camming action not only tightens the seam but also compresses it.

Both ends of the drum can be processed separately or simultaneously.

The compressed reinforced seven-layer seam 60 is relatively short.
In fact, the five layer seam 26 is considerably longer than the seven layer seam 60 due to compression effects. By reducing the seam length, a more compact seam, i.e.
Beads provided. In other words, seven layer seams 60
adds two layers of thickness, but is not two layers thicker in length than seam 26 due to the compression effect. In a standard five-layer seam drum, the aperture is approximately 3/4-1 inch deep.

The top and bottom chucks are moved from the retracted position to the activated position by conventional means, such as by hydraulic means, to retain the drum 20 therebetween. When the lower chuck assumes its operating position, the drum 20 rises. At this time, the upper chuck is inserted inside the end of the drum. The upper chuck is properly positioned on the top surface of the end closure member and tightly engages the inner edge of the apron of the five-layer seam.

The outer roll is pivotally connected to a rotatable arm. A cylindrical support roll 46 engages the outside of the drum 20 just below the five-ply seam 26.

Angle roll 48 rotates about a horizontal axis, engages drum 20 from above, and has a cylindrical surface and a tapered surface. This horizontally rotatable angle roll 48 is lowered when the drum 20 begins to rotate. The upper chuck 42 is rotated by conventional means such as a drive chain, and the lower chuck 4
0 is rotated with drum 20 and upper chuck 42 in the usual manner, such as by being mounted on ball bearings.

Angle roll 48 forms the seam at approximately 40-45 degrees to the horizontal. The angle roll 48 then rises and the cylindrical flat roll 50 moves onto the drum 20.
Fold the five-ply seam horizontally to a radial position approximately perpendicular to the axis of the Due to the inherent spring baggage of the material metal, the bend is not completely 90°, but is usually only a few degrees less. Although this is shown at 90° to the axis of the drum 20, there is an inherent return. When folding seam 26 into a flat position, drum 20 makes multiple revolutions during each action. An appropriate rotation speed is selected,
It is a matter of choice to rotate the metal material without shearing and to ensure sufficient bending.

The final forming action is carried out by horizontal movement of the forming rolls 52 forming the seven-layer seam 60 as described above. Shaping roll 52 is introduced after flat roll 50 and support roll 46 have been retracted. After the seven-layer seam 70 is finally formed, the forming roll 52 is retracted and the final formed drum is removed from the forming machine 34. The final seam is shown in FIG.

In practice, the entire operation is relatively fast and accomplished in a relatively short time, for example 3 seconds.

The purpose of this invention is to form a seam of five or more layers and a seam of at least seven layers.

In this way, several of the above objects and advantages are achieved very efficiently.

[Brief explanation of drawings]

1 is an exploded perspective view of a molding machine for forming a sealed drum and container; FIG. 2 is an enlarged partial cross-sectional view of the container showing a conventional five-layer seam taken along line 2-2 in FIG. 1; Figure 3 is a plan view of the container installed in the molding machine.
4 is an enlarged partial sectional view taken along the line 4-4 in FIG. 3, FIG. 5 is an enlarged partial sectional view of the container and molding machine shown in FIG. FIG. 7 is an enlarged partial cross-sectional view of the molding machine and container showing the seam bent at approximately 45 degrees, and FIG. 8 is an enlarged plan view of the molding machine and container taken along line 6-6.
FIG. 9 is an enlarged partial cross-sectional view of the molding machine and the container shown bent at 90 degrees; FIG. 9 shows the seam bent at approximately 90 degrees in FIG. Enlarged sectional view of the molding machine and container shown, No. 10
Figure 1 is an enlarged partial cross-sectional view of the molding machine and container showing the seam being further bent toward the final shape.
Figure 1 is an enlarged partial cross-sectional view of the molding machine and the container showing the seam bent into the desired shape, Figure 12 is a partial cross-sectional view of the container showing the seven-layer seam in its final shape, and Figure 13 is an enlarged partial cross-sectional view of the container with the seam bent into the desired shape. The first part that is clustered together
It is a figure similar to figure 2. 20...Drum, 22...Bottom closing member, 24
... Upper closing member, 25, 26 ... Five-layer joint, 3
2... Drum outer shell, 34... Molding machine, 40, 42
...Chuck, 46...Support roll, 48...Angle roll, 50...Flat roll, 52...Shaped roll, 60...Reinforcement joint, 62...Round slope part.

Claims (1)

[Claims] 1 forming a tubular shell forming a side wall of the drum, disposing on said shell at least one end closure member;
Adjacent peripheral edges of the outer shell and the end closure member are formed into a circumferentially extending joint, and both peripheral edges forming the joint are brought into surface contact with each other and are bent to form a five-layer joint in the radial direction. , the seams each extending parallel to the drum sidewalls, the shell and end closure including the seams are held in a fixed position, and then the seams are aligned relative to the longitudinal axis of the drum. The folded seam is then folded radially relative to the longitudinal axis of the drum by rolls that help to maintain its profile during the folding operation, and the seam is is bent inward by a power roll to abut against the adjacent side wall of the drum, and forms a seven-layer radially reinforced seam in conformity with the shape of the engaging surface of the power roll; The shape of the engagement surface of the power roll is such that the reinforcing seam has a long rounded slope extending from its bottom to an intermediate flat surface, with the maximum point in contact with the floor surface when the drum is rolled at the edge. The flat surface is configured to provide a contact surface that is relatively short and extends to the compressed top of the seam to provide a tight seal of minimum length, enhanced handling and strength properties. A method of manufacturing a sealed drum having a sealed end closure member providing said reinforced seam.