JPS627056B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a metal container, particularly a cylindrical metal container with a relatively large capacity, such as a steel drum, in which a top and bottom plate are secured to both ends of a cylindrical body by winding, and the manufacture thereof. METHODS AND APPARATUS.

Hereinafter, a steel drum will be explained as an example.

The steel drum is formed by fixing circular top and bottom plates to both ends of a cylindrical body. Generally, the fuselage and the top and bottom plates are fixed by overlapping flanges formed at both ends of the fuselage and the periphery of the top and bottom plates, respectively.
A method of wrapping both flanges multiple times is adopted. The seam part, that is, the seam part obtained in this way, is filled with a filler during the seam process, or is applied to the top plate flange surface before the seam process, so that the drum contents are not affected. This prevents leakage from the seam.

To tighten the seam, first, tray-shaped top and bottom plates are fitted into each end of a cylindrical body having flanges extending perpendicularly to the body axis. Then, a tightening chuck having a cylindrical molded surface is fitted into the top and bottom plates, and the body and the top and bottom plates are held and rotated. Next, the seaming roll having a forming groove is pushed down toward the forming surface of the seaming chuck with the tips of the flanges of the body and top and bottom plates inserted into the forming groove. As a result, the flange tip is guided by the side and bottom surfaces of the formed steel, and is rolled up and tightened. Next, the seaming portion is pressed and formed between the forming roll and the forming surface of the seaming chuck, and metal contact between the flanges is achieved.

The drum seat formed as described above affects the quality of the drum in terms of maintaining the drum structure and sealing the contents of the drum, but since the seam is against the outer edge of the drum, it does not raise the drum. Seams are prone to deformation, loosening, cracking, etc. due to being bent, knocked over, or bumping into other objects during transportation. This causes leakage. Therefore, in order to prevent such deformation, loosening, and cracking of the seam, the structure of the seam,
Many proposals regarding seaming methods or seaming devices have been made and implemented.

Regarding the structure of the seam part, for example, the US patent
There are 3736893 or 3987927.

The seam in US Pat. No. 3,736,893 is formed by overlapping the flanges of the fuselage and top and bottom plates and rolling them in a spiral shape, and has a circular cross section. It is claimed that because the seam thus formed has a circular cross-section, it generates a large moment of inertia in the radial direction and therefore provides a large strength in the radial direction. In this case, the adhesion between the layers of the flanges of the fuselage and top and bottom plates that are rolled up at the seam is maintained only by the rolling, and a relatively large gap is formed in the center of the seam. A certain amount of filler is sealed to ensure sealing performance. Therefore, not only does the cost of the filler increase, but also there is a risk that the contents may be deteriorated due to contact with the contents of the drum.

The seam in US Pat. No. 3,987,927 has a relatively small radius of curvature at the top of the seam (the first folded portion) to form an oval or oval cross section. By reducing the radius of curvature as described above, the strength of the top portion can be increased by processing hardness. However, this may cause excessive deformation of the top, which may cause cracks to form. Further, in the final seaming process, strong pressure is not applied to the seam portion, so the interlayer adhesion of the overlapped hooks (overlapping margin) at the center of the seam is insufficient compared to when strong pressure is applied. In addition, if excessive processing is applied to tighten the parts, there is a problem that the processed parts are likely to crack due to work hardening.

It goes without saying that drum manufacturing, particularly a seam tightening method and apparatus, must be capable of easily and reliably tightening a seam portion with excellent sealing performance and strength. Additionally, demand for drums made of thin steel sheets has been increasing in recent years. In order to increase the strength of the seam, triple-wound seams are widely used in such drums.

This invention was made to solve the above-mentioned problems with metal containers, and aims to provide a metal container having a seam portion with excellent sealing performance and strength.

Further, the present invention aims to provide a method and apparatus for manufacturing a metal container that can easily produce a container having a triple-wrap seam by modifying existing equipment at a very low cost. .

In the seam portion of the metal container of the present invention, the cross-sectional shape of the top portion is approximately a semi-ellipse or a semicircle, and the outer surface of the top portion is further extended outward in an arc shape to give the top surface a large radius of curvature. ing. Therefore,
The top can relieve stress concentration even if it receives an impact.

To explain in detail, the cross-sectional shape of the seam portion is generally a vertically long rectangle with roundness. Therefore, the fuselage flange and the top plate flange contact each other in parallel with the fuselage axis, and the center part is strongly pressed in the radial direction of the fuselage by an end bending and forming press roll, so that the top part that is not subjected to pressure is created. It is possible to eliminate the slight gap that existed between the two flanges and bring the flanges into metal contact, thereby increasing the strength and sealing performance of the seam. Furthermore, since the voids are significantly reduced by pressing, the sealing performance of the seam portion can be sufficiently ensured with a small amount of filler. The filler supplements the sealing properties of these areas by filling in the narrow areas where the seal is insufficient.

Furthermore, since both flanges are brought into metal contact as described above by pressing, there is very little contact between the filler and the contents of the container. Therefore, contamination of the contents by the filler and deterioration of the filler by the contents are prevented. In this way, pressing is an essential operation in this invention.

Further, the seam portion of another metal container of the present invention is formed in a wavy shape by making the outer surfaces of the top and bottom portions project outward in an arc shape. Therefore, the pressing force can be concentrated in the recess between the overhanging parts, eliminating the slight gap that existed between the body flange and the top plate flange, and bringing them into even closer contact. Seam damage is classified into peeling and cracking of the seam material. Leakage occurs at the seam because the seam unravels and loosens due to this peeling, or cracks occur in a portion of the seam. Therefore, the strength of the seam portion can be said to be the resistance to loosening and cracking due to such peeling.

The pressure applied to the center of the seam minimizes any voids left in the seam and creates a tightly interlocking seam that is strong against loosening.

When strong pressure is applied to the entire seam to prevent the seam from loosening, cracks may sometimes occur in the seam upon impact. Occurs when This often occurs at the top of the large and low seams or on the bottom body side. Therefore, it is preferable to finally apply pressure only to the center portion of the seam portion, which is hardly receiving any external force. The occurrence of cracks can also be prevented by appropriate selection of the steel material used. Furthermore, it is the top of the seam that receives the impact, and the impact force that the bottom receives is smaller than that. Therefore, if the steel material is appropriately selected, the bottom part can be pressed at the same time as the center part.

Further, in the method for manufacturing a metal container of the present invention,
A groove (hereinafter referred to as a recess) consisting of two different circular arcs, including an arc smaller than the thickness of the top and bottom plates, is specially provided in the first corner of the forming groove of the end bending/forming press roll prior to seaming. , Bend the tip of the top and bottom plate flange into a V shape at a position away from the tip of the body flange. By bending this end, the body and the top and bottom plate flanges can be easily rolled up in three layers. In this invention, since the end bending/forming press roll is used for end bending and press forming of the seam portion, there is no need to prepare separate dedicated rolls for end bending or pressing. Therefore, one roll can be effectively used in two stages of work, and manufacturing equipment can be simplified and work efficiency can be improved.

In the metal container manufacturing apparatus of the present invention, an arcuate recess with a cross-sectional shape having two curves is provided at the first corner of the forming groove of the end bending/forming press roll. Along the first of the two curves of this recess, the tip of the top and bottom plate flange first has a relatively small radius of curvature (about 2.0 to 2.5 times the plate thickness), then a relatively very small radius of curvature. (approximately 0.1 to 1.0 times the plate thickness), and the end is bent or bent at an angle of 90 degrees or more and 150 degrees or less, preferably 120 degrees to 140 degrees, especially by the second curve. Subsequently, the end bending/forming press roll stops, and at the same time as it waits, the seaming roll starts rolling the flange portion. Since the forming groove of the seaming roll has a substantially spiral cross-sectional shape, the flange part of the top and bottom plate can be smoothly formed into a spiral winding part without being subjected to excessive local processing. It hits the flange. At this time, the bending angle of the tip of the top and bottom plate flange is
280° or more. After this first round spiral part is formed, triple winding (seven-layer winding) is completed by tightening rolls, but at the center of the seam part, each flange end is not connected. be.

There, the tightening roll stops and retreats. At the same time, the end bending/forming press roll press-forms the seam portion. The concave portion of the forming groove of the end bending/forming press roll forms the shape of the above-mentioned overhang. Further, the convex portion or flat portion at the center of the end bending/forming press roll forms a press groove in the center of the seam portion. In this way, the concave part of the forming groove is formed by bending the 1' flange end and 2
It has two functions: press-forming the concave part at the center of the seam part and finishing the shape of the protruding part of the seam part.

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

FIG. 1 shows a state in which a tray-shaped top and bottom plate 21 is temporarily fitted onto the cylindrical body 11 of the drum 1 before the seaming process. As shown in the drawings, both ends of the body 11 are bent outward at right angles to the body axis 2 to form flanges 12. Also,
The top and bottom plates 21 are also bent so that their peripheral edges are along the flange 12 of the body to form a flange 22.

FIG. 2 is an enlarged detailed view of the flanges 12 and 22, and as shown in this figure, the flanges 1
The bases of 2 and 22 are bent with radius l and m, and the flange 22 of the top and bottom plate 21 is
It is longer than the flange 12 of No. 1. The lengths A and B of the flange must be such that the seam part is triple wrapped. Also, the size of the radius l and m of the flange base (radius of curvature) is
2 is selected so that it smoothly enters the forming groove of the tightening roll, which will be described later, and is bent and formed. According to the experience of the inventors, the following sizes are appropriate.

l=(10~16)×tmm m=(5~10)×tmm However, t is the plate thickness.

The body and the top and bottom plates, which have been temporarily fitted as described above, are held by a seaming chuck, and then seamed by a seaming roll.

FIG. 3 is a front view schematically showing the seaming device. The tightening chuck 31 is attached to a base plate 32, and rotated integrally with the base plate 32 in the direction of arrow C by a drive shaft 33. Further, the seaming chuck 31 is fitted into the recess of the top and bottom plate 21,
The body 11 and the top and bottom plates 21 are held by a seaming chuck 31.

The seaming roll 4 is close to the seaming chuck 31.
1 and an end bending/forming press roll 51 are provided. Both rolls 41 and 51 are spaced at an appropriate distance (for example, 15 degrees) in the circumferential direction from the vertical center line N.
It is located at a distance. Both rolls 41 and 51 are rotatably supported by a shaft 63 at the lower part of a rolling member 62 that moves up and down guided by a casing 61, and are connected to the rotation of the seaming chuck 31 through the seaming portions of the body and the top and bottom plates. Follow and rotate. Further, a contact roller 64 is rotatably attached to the top of the rolling member 62, and a cam 65 is in contact with this contact roller 64. cam 6
5, the rolling member 62 moves up and down, and the seaming roll 41 and the end bending/forming press roll 51 move in the radial direction of the seaming chuck 31.

A guide device 71 is provided adjacent to the tightening chuck 31. The guide device 71 is arranged at an appropriate interval (for example, 45 degrees) from the tightening roll 41 in the direction of movement of the clock hands. The guide device 71 uses guide rolls (not shown) provided thereto to end bend and form the flanges of the body and the top and bottom plates by a pressing roll 51 and a seaming roll 41.
It works to correctly introduce it into the molding groove.

FIG. 4 shows details of the molding for the preferred shape of the seaming chuck.

As shown in this drawing, the seaming chuck 31 has a cylindrical molded portion 34 provided with a fillet 35 having a substantially triangular cross-sectional shape. One surface 36 of the fillet 35 serves as an entrance guide surface 48 of the tightening roller 41.
The reference plane 38 extends in close proximity to and faces the reference plane 38 . The other surface of the fillet 35 is a slope (hereinafter referred to as the fillet slope 37), and when the seaming roll 41 approaches the seaming chuck 31, the fillet slope 37 forms a slope as shown in FIG. Exit corner 4 of forming groove 42 of the seaming roll shown
Facing 6.

The fillet slope 37 is formed into a concave curved surface (the contour line is a quarter arc).

When a seaming chuck having such a forming surface is used, the corners of the inner edge of the seam portion are smoothly bent, and a strong and tight seam portion is obtained without any angularity. However, it is not necessary to provide the fillet in the tightening chuck.

The tightening roll 41 is attached to the body 11 and the top and bottom plates 21.
The flanges 12 and 22 are bent and rolled in an overlapping state, and then tightened. FIG. 5 is a sectional view of the tightening roll 41, and the tightening roll 41 has a forming groove 42 along the circumference. The molding groove 42 is approximately D-shaped and opens toward the molding surface 39 of the seaming chuck 31. From the entrance side surface 43 of the forming groove 42 (the side where the flange enters, the right side surface in the drawing) to the first corner portion 44
The cross section is approximately a quarter arc. A groove bottom 45 following the first corner portion 44 is a straight line. Further, the second corner portion 46 following the groove bottom 45 has a radius of curvature smaller than the radius of curvature of the first corner portion 44 and is a quarter arc.
The exit side surface 47 following the second corner 46 is a straight line. A guide surface 48 extends downward from the entry side surface 43, and guides the flanges 12, 22 entering the forming groove 42.

The dimensions of each part that determines the cross-sectional shape of the forming groove 42 must have a good shape and have the following values in order to form a tight seam.

Radius of curvature of first corner p = (3.0 to 6.0)t
mm Radius of curvature of second corner q=(1.5~4.5)t
mm Length of the groove bottom straight section D = (0 to 3.0) tmm Length of the exit side surface E = (1.5 to 4.0) tmm The end bending/forming press roll 51 is the seam part that is tightened by the above-mentioned tightening roll 41 Shape it into the desired shape and press the center part to make the seam even tighter. FIG. 6 is a sectional view of an end bending/forming press roll for shaping the seam portion so that the cross-sectional shape is approximately rectangular. End bending/forming press roll 5
1 has a forming groove 52 along the circumferential direction. The molding groove 52 has a substantially rectangular shape and opens toward the molding surface 39 of the seaming chuck 31. First corner 54 and second corner 5 of molding groove 52
6 is approximately a quarter arc. Further, the depth h and width w of the forming groove 52 are equal to one half of the thickness of the seam portion and the height of the seam portion, respectively.

Further, the molding groove 52 is provided with a recess 57 having an arcuate cross-sectional shape at the first corner 54 . 7th
Approximately 1/4 of the first corner 54 as shown in the figure
The bottom surface of the recess 57 is formed so that an arc (radius u) is followed by an arc approximately 1/6 of the radius x. Appropriate dimensions for each part are as follows.

Radius of curvature of the first corner u = (2 to 2.5) tmm Radius of curvature of the second corner x = (0.1 to 1.0) t
mm Depth y≒0.5tmm (0.3 to 0.8t) Furthermore, a guide surface 58 extends downward from the entrance side surface 53 of the forming groove 52, and the guide surface 58 is used for the winding material entering the forming groove 52. guide the flange.

Next, a method of wrapping and tightening the flanges of the fuselage and the top and bottom plates using the above-mentioned device will be explained.

First, as shown in FIG. 8, the end portion 23 of the top and bottom plate flange 22 is
Bend the ends. When the end bending and forming press roll 51 is pushed down toward the seaming chuck 31, the flange tip portion 23 of the top and bottom plate 21, which is fitted into the cylindrical forming part 39 of the chuck and held by the seaming chuck 31, is bent and formed. It enters the forming groove 52 guided by the guide surface 58 of the press roll. As shown in the figure, while moving along the bottom surface of the recess 57 of the forming groove 52, the flange tip 23 is bent over 90 degrees by a circular arc with a radius of curvature smaller than the thickness of the above-mentioned top and bottom plates provided in the recess 57. The edges are sharply bent.

Note that a filler is supplied to the vicinity of the flange tip 13 of the body 11 before or after the end bending process.

When the end bending is completed, the end bending/forming press roll 51 is kept on standby at that position, and the seaming roll 41
is pushed down, and the fuselage flange 12 and top plate flange 22 are rolled up. FIG. 9a shows the initial stage of tightening, FIG. 9b shows the intermediate stage, and FIG. 9c shows the final stage.

When the tightening roll 41 is further pushed down toward the tightening chuck 31, the flanges 12, 22 enter the forming groove 42 along the guide surface 48. Flange 1
2 and 22 are curved along the first corner portion 44 and reach the second corner portion 46 after passing through the linear groove bottom 45 . At the second corner section 46, the flanges 12, 2 are pre-curved at the first corner section 44.
2 is also curved with a larger curvature. In this way, the flanges 12 and 22 are bent in two stages with two large and small curvature radii in the forming groove 42, so that the bending deformation proceeds smoothly, and the flange 1
2 and 22 are large, and excessive deformation stress does not occur during bending.

The seam portion formed by tightening as described above is formed into a desired shape and further pressed. FIG. 10 shows the cross-sectional shape of the seam portion processed in this molding and pressing process. When the seam portion 5 shown in FIG. 9c is formed, the seaming roll 4
1 retreats (raises), and the end bending/forming press roll 5
1 is coming down. The seam part 5 is the outer half (10th
The upper half (in the figure) enters the rectangular forming groove 52 and is pressed in the seam thickness direction between the forming surface 39 of the seaming chuck 31 and the groove bottom 55 of the forming groove 52, and the fillet slope 37 and molding groove 52
The seam portion 5 is pressed diagonally between the exit corner 56 of the seam portion 5 and the exit corner 56 of the seam portion 5 . Therefore, the seam portion 5 can be accurately formed into the required shape, and the slight gap that existed between the two flanges can be eliminated, so that the two flanges can be more tightly wound and brought into metal contact.

FIG. 11 is a graph showing the relationship between the rotation angle of the cam that raises and lowers the tightening and end bending/forming press rolls and the amount of descent of these rolls.

In Fig. 11, the curve indicates the tightening roll,
The curves indicate the end bending and forming press rolls, respectively. Further, section K indicates an end bending process, section L indicates a rolling process, and section M indicates a forming process.

As shown in this drawing, as the cam rotates, the end bending/forming press roll is first lowered toward the forming surface of the seaming chuck relative to the seaming roll to bend the end of the flange of the top and bottom plate, and then The seaming roll is lowered below the end bending/forming press roll to tighten the flanges of the body and top and bottom plates. Then, the end bending/forming press roll is again lowered below the seaming roll (actually, the seaming roll is raised and returned to its original position) to form the seaming portion. In addition, Fig. 2 written in the figure,
Figure 8, Figure 9 a, b, c, Figure 10, etc.
The forming steps shown in these drawings are shown in correspondence with the cam rotation angle.

FIG. 12 is an enlarged cross-sectional view of the seam portion 5 that has been rolled and tightened as described above. The top portion 5a is a portion shaped at the entrance side of the forming groove 52 of the end bending/forming press roll 51 shown in FIGS. 6 and 10, and has a substantially semi-elliptical cross-sectional shape. The overhanging portion 5b is a portion that overhangs due to the pressure of the recess 57 provided in the forming groove 52 of the end bending/forming press roll 51 during shaping. Appropriately, the overhang amount z of the overhang portion 5b with respect to the center portion 5c is about 1/2 of the plate thickness. The central part 5c is an end bending/forming press roll 51
The body flange 12 and the top plate flange 22 are pressed by the flat part of the groove bottom of the forming groove 52.
is parallel to the fuselage axis throughout the entire layer. central part 5
Since c is strongly pressed in the radial direction of the body, the flanges 12 and 22 are in direct contact with each other in this portion. The filler 9 is separately sealed in spaces provided between the tips of the body flange 12 and the top and bottom plate flanges 22 and the bent portions of these flanges. Although the bottom portion 5d of the seam portion 5 has a smaller cross section than the top portion 5a, it has substantially the same shape as the top portion 5a.

Fig. 13 shows another example of the forming groove of the end bending/forming press roll, and Fig. 14 shows an enlarged cross section of the seam formed by this forming groove. The molding groove 74 of the roll 73 is provided with arcuate recesses 76 of the same size formed on the entry side and the exit side, respectively. The radius u of the corner portion 75 and the depth y of the recess 76 are approximately the same as those shown in FIG. 7, but the arc drawn by the radius u from the straight portion 77 is approximately ⅓ of a circular arc. The bottom surface between the recesses 76 is a curved line convex to the body axis or a straight line 78 parallel to the body axis.

The seam portion 6 formed by the end bending/forming press roll 73 has overhanging portions 6a at the top and bottom, respectively.
is formed. The overhang amount z is almost the same as that shown in FIG. Overhanging portion 6a and overhanging portion 6a
It is strongly pressed by the central part 6b between.

In this seam part 6, the central part 6 is
Since the pressure by the end bending/forming press roll 73 is concentrated on the area b, the top and bottom of the seam portion 6 are not subjected to excessive processing. Therefore, compared to the seam 5 shown in FIG. 12, this seam 6 has less work hardening at the bottom, and there is less risk of cracking even if the seam is subjected to excessive deformation during container handling.

FIG. 15 shows still another example of the forming groove of the end bending/forming press roll. The forming groove 80 of the end bending/forming press roll 79 in this example is provided with recesses 82 having the same shape and size on the entry side and the exit side, respectively. An arcuate recess 83 is formed between the recesses 82 . The seam portion formed by this end bending/forming press roll 79 has a shape in which the central portion 6b of the seam portion shown in FIG. 14 forms small waves.

Note that the present invention is not limited to the shape of the press-formed portion at the center of the seam portion.

[Brief explanation of the drawing]

Figure 1 is a schematic sectional view of the top and bottom plates temporarily fitted to the body, Figure 2 is an enlarged sectional view of the flange of the body and the top and bottom plates, Figure 3 is a schematic front view of the seaming device, and Figure 4 4a is a cross-sectional view of the forming part of the seaming chuck used in this invention, FIG. 4b is an enlarged sectional view of the fillet provided in the forming part, and FIG. 5 is a forming groove of the seaming roll used in this invention. 6 is a detailed sectional view of the forming groove of the end bending/forming press roll, FIG. 7 is an enlarged view of the forming groove shown in FIG. 6, and FIG. 8 is an explanation of the end bending process in this invention. Figures 9a, b, and c are explanatory diagrams of the winding process, Figure 10 is an explanatory diagram of the forming process, and Figure 11 is the rotation angle of the cam that raises and lowers the seaming and end bending/forming press rolls and these. Diagram showing the relationship with the amount of descent of the roll, 1st
Figure 2 is an enlarged sectional view of the seam formed by the end bending/forming press roll shown in Figure 6, and Figure 13 shows another example of the end bending/forming press roll.
FIG. 14 is an enlarged sectional view of the seam formed by the end bending/forming press roll shown in FIG. 13, and FIG. 15 is another example of the forming roll. It is an enlarged view of a groove. 1... Metal container, 5, 6, 7... Seam part,
5a, 6a... overhanging portion, 9... filler, 11...
... body, 12 ... body flange, 21 ... top and bottom plate, 22 ... top and bottom plate flange, 31 ... seam chuck, 34 ... molded part, 35 ... fillet,
37... Fillet slope, 41... Sealing roll, 42... Forming groove, 51... End bending and forming press roll, 52, 74, 80... Forming groove, 57, 7
6,82... recess.

Claims (1)

[Claims] 1. Consisting of a cylindrical body and tray-shaped top and bottom plates fixed to both ends of the body, the body has a body flange formed by bending both ends of the body in a direction perpendicular to the body axis. , the top and bottom plate has a top and bottom plate flange formed by bending its peripheral edge along the body flange so as to protrude further outward from the body flange, and the top and bottom plate is formed by overlapping the body flange and the top and bottom plate flange. In a container that is fitted into the end of the body and wrapped around the body flange and the top and bottom plate flanges to form a triple seam part, the seam part has a top and bottom cross-sectional shape that is approximately a semi-ellipse or a semi-circle as a whole. It has a nearly vertical rectangular cross section, the outer surface of the top protrudes outward in an arc, the intermediate part between the top and bottom is generally parallel to the container axis, and the body flange and top plate flange are strongly pressed together. A metal product characterized in that the flanges are in metallic contact with each other, the flanges overlap at the center of the seam, and the space between the tip of one flange and the bent part of the other flange is sealed with a filler. container. 2. The metal container according to claim 1, wherein the outer surfaces of the top and bottom of the seam portion protrude outward in an arc shape. 3 A fuselage flange formed by bending both ends of the cylindrical fuselage outward at right angles to the fuselage axis, and a peripheral edge of the tray-shaped top and bottom plate extending further outward from the fuselage flange along the fuselage flange. The top and bottom plate flanges formed by bending are overlapped, the top and bottom plate is fitted into the end of the body, a seaming chuck having a cylindrical molded surface is fitted into the top and bottom plate, and the body and the top and bottom plate are held by the seaming chuck, A seaming roll and an end bending/forming press roll each having a forming groove opening toward the forming surface of the seaming chuck and extending along the circumference are applied to the forming surface of the seaming chuck while rotating the seaming chuck. In this method, the body flange and the top and bottom plate flanges are triple-wound and tightened through the forming groove, and the top and bottom plate flanges are triple-wound and shaped to form a seam. The end is bent at the first (entering side) corner of the groove, and then the body and top plate flange are wrapped and tightened in the forming groove of the seaming roll, and after the seaming is completed, the end is bent in the specified shape with the forming groove of the end bending and forming press roll. 1. A method for manufacturing a metal container, comprising forming a seam. 4 Rotatably drive a cam operatively connected to each of the end bending/forming press rolls and the seaming roll to move them up and down toward the forming surface of the seaming chuck. The end bending is performed by lowering the end bending roll than the seaming roll, and then the seaming roll is lowered lower than the end bending/forming press roll to perform the seaming, and the end bending/forming press roll is lowered again below the seaming roll. 4. The method for manufacturing a metal container according to claim 3, wherein the molding is performed by causing the molding to take place. 5. A seaming chuck having a cylindrical forming surface that is rotatably driven and holding the body and the top and bottom plates which are integrated by fitting tray-shaped top and bottom plates into both ends of the cylindrical body, and a seaming chuck, respectively. It has a forming groove that opens toward the forming surface of the seaming chuck and extends along the circumferential direction, and is movable toward the forming surface of the seaming chuck and is rotatably supported. In an apparatus that includes a forming press roll and triple-wraps and shapes a body flange extending perpendicularly to the body axis and the top and bottom plate flange using the tightening roll, the first forming groove of the end bending and forming press roll ( 1. An apparatus for manufacturing a metal container, characterized in that a recess for end bending is provided in a corner portion (inlet side). 6 The end bending/forming press roll is the first (input side)
Claim 5, characterized in that a recess is provided in each of the and second (output side) corner portions.
An apparatus for manufacturing a metal container as described in 1.