JPH032745B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal container having a seam and a method for manufacturing the same.

For example, in a normal steel drum, a flange portion is formed at the peripheral edge of the body plate, the top plate, and the base plate, and the flange portions are properly stacked and the body plate, top plate, and base plate are temporarily fitted,
It is manufactured by winding each flange portion multiple times to form a seam portion (sealing portion). The seam portion of conventionally known metal containers has a shape such as an ellipse, an oval, a rectangle with rounded corners, a spiral, an ellipse, or a modified oval in cross section. The structure is such that the tips of the flanges of the body plate, top plate, and base plate are folded flat and interlocked with each other at the center of the seam, and the flanges following the tips are wound in parallel and spirally. The main types are structures for shapes such as ellipses, ovals, and rectangles, and structures for spiral shapes whose radius gradually changes. These circular seams have a flat interlocking joint in the center, so they require a larger amount of metal plates than, for example, a spiral-shaped seam in which the radius gradually changes, and are therefore expensive to manufacture and economical. It has the disadvantage that the objective strength of the seam part is significantly uneven in each direction, and the seam part of the spiral shape whose radius gradually changes is usually composed of two metal plates and cannot be tightened. Since the forming groove of the roll can only have an opening angle of 180°, the metal plate that exits the forming groove of the roll becomes an arc with the radius of curvature of the exit of the roll, so there is an arc in some parts, making it difficult to manufacture. Alternatively, there is a drawback that a gap is formed in the center of the seam, and as the size of this gap increases, the external shape of the seam increases, and a large amount of metal plates are required. A typical conventional manufacturing method is Wessely's method (or Gallay method), in which (1) the flanges of the top and bottom plates (top plate or bottom plate, hereinafter referred to as top and bottom plates) are rolled using rolls. Curl the tip until it faces the body plate flange (see Johnston, U.S. Pat. No. 3,160,312 and (Compo, U.S. Pat. No. 2,337,452). While giving relative movement (principle of stacked plate bending using the well-known seaming technique that has long been used in the production of five-layer seam parts) The peripheries of both flanges are rolled, and the peripheral edges of both flanges are interlocked and joined to form a seam part in seven layers alternately (see Rheem, US Patent No. 2169395 and Defauw, British Patent No. 506182, etc.). Above (1), Manufacturing method that continuously performs (2) and (3) (Wessely, U.S. Patent No. 3425381-
Re.29307).

The effect of this combination of known elements is that, according to this method, a seven-layer winding can be obtained by continuous seaming with rolls without pressing the seam flat at the end of seaming. The disadvantage of this method is that the top and bottom plate flanges form the outline of the seam along the forming grooves of the seaming roll, and at the end of seaming, the tips of both flanges abut against the other facing flange, deforming and forming the seam. When the flanges are in contact with each other and seaming is completed, the tips of both flanges are engaged to form the center of the seam, so the deformation of the tips of both flanges that make up the center of the seam is unstable and the engagement is unstable. Also, the close contact between the flanges is often unstable and irregular, and the flanges constituting the seam portion do not come in perfect contact with each other, that is, a gap is created.

Another example of a conventionally known manufacturing method is the Coppens and Steen method (or Van Leer method). Curled and then rolled inward over 180° with a very small radius to form a hollow rim and filled with a sealing compound (see WR Grace & Co.). ), Dewey and Almy Technical Report, January 15, 1954 (Dewey
(2)' The radius of curvature of the body plate flange is substantially larger than the radius of curvature of the top and bottom plate flange, and a semicircular shape is formed. A roll having a cross-sectional nut is folded back to form a close spiral turn (see Kinney, U.S. Pat.
2460296; Johnston, US Pat. No. 3,160,312 and Krummel, German Patent No. 217,070, etc.), (3)' The shape of the winding is such that the inside completely follows the outside, with the outer edge of the body flange being Pressure is applied to the sealing means at the hollow edge of the top and bottom plate flanges (it is physically obvious that the sealing means is pressed by the seaming process following item (1) above, even in canned goods and other containers.

These are the production methods according to (1)', (2)', and (3)' (Coppens & Steen, Dutch Patent No. 6911769 and No. 7009657; US Patent No. 3736893; Japanese Patent No. 989815).

The effect of this known combination of elements is (4)' a closely spiral cross-section with a gradual change in radius and substantial metallic contact between the interlocking flanges (see Robinson). , US Pat. No. 1,389,900; Krummel, German Pat.
217070; Sebell, US Patent
2197439), (6)' The core is completely filled and under pressure (it is necessarily under pressure if the sealing means is sealed and dried in advance according to (1)' and then sealed), A seam section is obtained by combining the seam sections (4)' to (5)' above.

The disadvantage of this seam part and its manufacturing method is that the top and bottom plate flanges form the outer shape of the seam part along the semicircular groove of the seaming roll, and at the end of the seaming process, the hollow edge (U-shaped or The bending moment that causes this deformation is large at the U-shaped curved part and the following flange, and is restrained by the tip of the semicircular shell plate flange. Therefore, the radius of bending curvature of the hollow edge expands and the seaming process is completed while the bent straight part of the hollow edge remains straight. Therefore, the sealing means filled in advance must be sufficiently elastic and large enough to withstand the deformation of the hollow edge. Another problem is that the bent portion of the hollow edge, which remains straight, does not come into close contact with the flange portion of the facing body plate, creating a gap.

The feature of the spiral seam part and its manufacturing method in Japanese Patent No. 989815 is that it has an extremely large amount of sealing compound in the center of the seam part, and in the manufacturing method, the edge of the body plate flange during seaming is inside the hollow edge of the top and bottom plate flange. That is, it is engulfed in the sealing compound but does not move relative to the hollow edge.

The hollow edge in this method is described in priority Dutch patent 7009657 as the hollow edge shown in the figure, which shows a U-shape with a long straight section. Also, US Patent No. 373689 clearly states that it is U-shaped. It is therefore clear that the hollow rim is U-shaped.

Figure 1 A, B, and C and Figure 2 A, B, and C are when temporarily fitting 5-layer winding and 7-layer winding (at the start of seaming) using this method.
A cross-sectional explanatory diagram showing the state at the end of seaming and at the completion of seaming, in which 1 is a top and bottom plate flange, 2 is a body plate flange,
R indicates the forming groove of the seaming roll, 1' and 2' indicate the main body portions following the flange portions of the top and bottom plates and the body plate, respectively, and the one-dot chain line indicates the center line of the semicircular groove R.

Figures 1A and 2A show the temporary fitting, that is, the start of seaming, and as the semicircular groove R of the seaming roll descends, both flanges of the top and bottom plates and the body plate are wound and tightened.

Figure 1 (b) shows the state when the tip of the body plate flange is wound 180° in 5-layer winding, and Figure 2 (b) shows the winding state in which the U-shaped tip hits the body plate flange in 7-layer winding. . In both figures, the tip of the body plate flange is U.
It is wrapped in a U-Shaped bend,
If the plate thickness is the same, the winding will be a certain certain amount determined by the length of the U-shaped protruding straight part, the relative position of the tips of both flanges during temporary fitting, and the radius of curvature of the semicircular groove R of the seaming roll. Winding begins at a certain winding angle, and winding is completed at another fixed winding angle. Due to the bending process using the semicircular groove of the seaming roll, the 180° bending angle of the U-shape is reduced.On the other hand, when the tip of the top and bottom plate flange hits the body plate flange, the bending angle is enlarged, but the U-shape is hollow. Since the width of the edge is larger than the thickness of the board, the overall U
The 180° bending angle of the shape is reduced. If we compare Figures 1A and 2A with Figures 1B and 2B, and Figures 1C and 2C, it is theoretically possible that the relative positions of the tips of both flanges will move. It is clear that

Figure 1B is an explanatory diagram showing the state when the tip of the shell plate flange is wound 180 degrees.Since it is a 5-layer winding, the winding must be completed, and in the state shown in the figure, the winding must be completed. The outside of the U shape does not fit against the opposing shell plate flange and the sealing compound is not in the center of the seam. Therefore, the U-shape must be deformed by hitting the shell plate body 2' before reaching the state shown in FIG. 1B. That is, in this method, it is a necessary condition that the U shape abuts against the shell plate main body 2' and is deformed. The force that causes this deformation acts at the point where the U-shape hits the body plate main body 2', and the maximum bending moment acts at the exit of the semicircular groove R of the seaming roll of the top and bottom plate flange 1. Therefore, the top and bottom plate flanges following the U shape undergo maximum bending at the exit of the R. The tips of the top and bottom plate flanges are restrained by the semicircular body plate flange and generate deformation force, and the maximum bending moment occurs at the point where the U shape hits the body plate main body 2', and the bending angle of the U shape is Expand and open the U shape. As a result, the seam portion is formed as shown in FIG. 1C. As shown in Figure 1C, the upper half of the seam part is circular, and the lower half is formed by a curved line and a straight line.In particular, the top and bottom plate flanges have two shapes whose radius gradually changes at the center of the seam part. A curved line and two straight lines are formed, and one of the straight lines is the straight part of the U shape, and the bending moment that opens the U shape is
It stays in a straight line because it is smaller than the one acting on the point it hits. Therefore, a gap is created between the tip of the top and bottom plate flanges and the opposing body plate flange, making it extremely difficult to bring the two flanges into complete contact.

FIG. 2B is an explanatory diagram showing a state in which the U shape abuts against the body plate flange 2 in seven-layer winding. Assuming that the lower side of the top and bottom plate flange 1 hits the body plate main body 2' and is deformed before reaching the state shown in FIG. 2B,
Both flanges 1 due to the force acting on the abutting point.
The maximum bending moment acts on 2 and 2 at the exit of the semicircular groove R of the seaming roll, and both flanges 1 and 2 undergo the maximum bending deformation at the exit, while the U-shape of the top and bottom plate flanges is 2, and the force acting on the abutting point causes both flanges 1 and 2 to
A bending moment in the opposite direction to the bending moment acts at the exit of the semicircular groove R, and a maximum bending moment acts at the point where the top and bottom plate flange 1 collides with the body plate body 2' on the lower side, and the top and bottom plate flanges are tightened by seaming. Bending deformation in the direction. Due to this bending deformation, the U shape is deformed in the direction of reducing its width, but since the tip of the top and bottom plate flange 1 is restrained inside the semicircular body plate flange, the U shape opens its width and The straight portion of the shape is bent to form a seam as shown in FIG. 2C. Although the seam part is schematically drawn in Fig. 2C, it is actually complex; the upper half is circular, and the lower half is formed by curved lines and straight lines.In particular, the top and bottom plate flange 1 has a radius at the center of the seam part. Two gradually changing curves and two straight lines are formed, and the tip does not come into close contact with the opposing shell plate flange 2, creating a gap, and the difference in the winding angles of the tips of both flanges exceeds 180°. If the straight part of the U-shape is shortened so as not to exceed 180°, the tip of the top and bottom plate flange will be less likely to be restrained by the inside of the body plate flange.
The shape deformation is small and the void becomes larger. In Fig. 2B, the lower side of the top and bottom plate flanges is the body plate main body 2'.
If it does not deform when it hits the body plate flange, all of the body plate flanges will be formed into a circular shape, and the U-shape of the top and bottom plate flange will only deform when it hits the body plate flange, and the formation of the center of the seam of the top and bottom plate flange will be similar to Fig. 2 C. It is clear that the gap becomes larger and the void becomes larger. The disadvantage of such a seam is that the U-shape is formed in advance and then seamed.
Due to the manufacturing method which changes the radius of curvature of the shape and thus rotates the protruding straight part of the U-shape, such a manufacturing method results in a seal that is completely filled in the center of the seam when seaming is completed. In order to ensure that the sealing means is elastic enough to withstand expansion deformation at the start of seaming, an extremely large amount of sealing means must be placed from the inside of the U shape to the tips of the top and bottom plates. The center part is large enough to allow rotation of the protruding straight part of the U shape as the radius of curvature of the U shape changes, so the outer diameter of the seam part is large and a metal plate that forms a large amount of seam part is required. The tip of the top and bottom plate flange remains straight or curved and does not come into close contact with the opposing body plate flange. In addition, since such a seam part is formed into a U-shape in advance and a sealing means is filled and dried in the U-shape prior to seaming, the manufacturing method of the above-mentioned U.S. Patent Re. 29307 requires more steps and equipment. The manufacturing cost is high, the body plate flange is formed into an arc with a large radius of curvature during temporary fitting before seaming, so the temporary fitting with the top and bottom plate is loose and easy to fall off, and the U-shaped is unstable and the seam part forms an unstable curve and straight line on the side that is not in contact with the semicircular groove, making it difficult to accurately theoretically set the lengths of both flanges of the body plate and top and bottom plates. Therefore, the uniformity of the seam produced, especially the uniformity of the structure in the center of the seam, is such that the straight part of the U-shape remains straight or deforms into a curved part and the seam part There are drawbacks such as the difficulty in obtaining a close contact structure between both flanges at the core.

Unstable deformation of the metal plates constituting the seam during tightening and the unstable shape of the seam itself are common drawbacks of conventional seams and their manufacturing methods, and therefore A common drawback is that the lengths, straight parts, curved parts, etc. of both flanges cannot be calculated and set accurately theoretically.

An object of the present invention is to improve the drawbacks of the seam of a metal container having a seam, a method for manufacturing the seam, and a manufacturing apparatus for the seam, and to form the center of the seam regularly and uniformly. It has excellent strength, does not create voids that impair the strength and leak resistance of the product, and can be filled with a small amount of sealing compound.
The object of the present invention is to economically produce metal containers having uniform seams of uniform quality in construction.

The technical idea of the present invention is that the seam in question should ideally have a circular outer shape, but by wrapping multiple metal plates closely and alternately, it is possible to create a circular shape from the center of the seam to the entire outer shape. Since it is physically impossible to do so, the desired seam portion can be obtained by configuring a plurality of metal plates to form two types of continuous concentric arc groups with offset centers. The radius of curvature of the center of the seam can be made small to the extent that the metal does not cause cracks, and the arcuate portion of the center can be omitted depending on the required strength of the seam, thereby saving on the amount of metal required. It is possible.

The technical idea of the present invention is that the conventional method for manufacturing a seam part is to form the outer shape of the seam part along the forming groove of the seaming roll at the beginning of the seaming process, and to form the outer shape of the seam part along the forming groove of the seam roll at the end of the seaming process, and to form the outer shape of the seam part along the forming grooves of the seam part at the end of the seaming process. The center part of the seam part has the smallest radius of curvature in the seam part when the seam is completed by bending and deforming the tip part against the flange of the outer layer. Therefore, the structure of the center part becomes unstable and irregular. However, it has the disadvantage that a gap is created between the two flanges that make up the seam part, or between the tip of the top and bottom plate flange in the center and the body plate flange facing it. The sealing roll and chuck ring have two centers with a center distance of 1/2 of the sum of the thicknesses of the top and bottom plates (top and bottom plates and body plate), and a groove with a cross-sectional curve having two continuous arcs. Accordingly, in a cross section of a plurality of metal plates constituting a seam portion, a plurality of circular arc portions having a difference in radius of curvature equal to the center distance and continuous, a plurality of circular arc portions having a center angle of 180° or 180° and 180° or less. A seam part is formed in the circular arc part by forming two types of continuous concentric circular arc part groups formed by two centers having the above-mentioned center distance into a point-symmetrical shape with the center of symmetry being the midpoint of the two centers. In this way, the above-mentioned drawbacks can be solved. In the molding of the present invention, the metal plate constituting the seam portion is molded along a plurality of continuous circular arcs, and the molding is extremely smooth and easy without causing deformation of the tips of both flanges due to abutting, as in conventional molding methods.

The technical idea of the present invention is to form the tip of the body plate flange along a plurality of continuous arc-shaped top and bottom plate flanges, form the center of the seam part at the initial stage of seaming, and then form the center part of the seam part along the outer side of the center part. The seam is completed by wrapping both subsequent flange parts around the flange, or wrapping and tightening the center part around the inside of the following shell plate flange, and forming the outside of the seam part in sequence. To accurately and reliably form the center of the seam part, and to create a stable and uniform seam part without creating a gap between the metal plates of both flanges that make up the seam part, using less metal plates and economically constructing the seam part. . Voids in the seam not only impair quality but also increase the amount of metal plate used.

Furthermore, the technical idea of the present invention is that, in the first step, a first seaming roll having forming grooves with a cross-sectional curve having a radius of curvature smaller than the radius of curvature of the outer shape of the desired seam portion is used at the tip of both flanges to form the desired shape. Winding from the seam part, forming a seam part with a smaller winding layer, followed by forming a forming groove with a cross-sectional curve equal to the outer shape of the desired seam part, or a cross-section with a radius of curvature larger than the first seaming roll. Winding from the desired seam part or the seam part formed in the first stage by a second seaming roll having a curved forming groove and a chuck ring,
The purpose is to form any desired seam with a large layer of winding.

Based on the above-mentioned technical idea, the present invention provides a metal container having a seam portion that has a minimum volume for the same strength, uses a minimum amount of material, and has little variation in quality, its structure, and the smoothest and easiest manufacturing method. The gist of the present invention is to provide a metal container having a seam portion at least at one end of the container body in which a top plate flange and a body plate flange are closely and alternately wound. The main plate flange and the body plate flange are made up of a plurality of closely spaced circular arc parts, forming two sets of concentric circular arcs whose centers of curvature are shifted from each other. One end of the circular arc part smoothly connects to one end of the other circular arc part, and the distance between the centers of curvature of both concentric circular arc groups is 1/2 of the sum of the plate thickness of the top and bottom plate flange and the plate thickness of the body plate flange. A metal container characterized by the metal container, each concentric arc group consisting of an arc portion with a central angle of 180°, each concentric arc group consisting of an arc portion with a central angle of 180° and a circular arc portion with a central angle of less than 180°. The metal container has a point-symmetrical arc portion having a center of symmetry about the midpoint of the centers of curvature of both concentric arc groups, and the common line passing through the center of curvature of both concentric arc groups is made of metal. The metal container is inclined with respect to the axis of the container; The metal container has a common line passing through the centers of curvature of both concentric arcs that is parallel or perpendicular to the axis of the metal container; The center of curvature of one of the concentric arcs. is located at the center of the thickness of the top and bottom plate flange, and the center of curvature of the other concentric arc group is at the center of the thickness of the body plate flange. The above-mentioned metal container is (0.5 to 1.0) times the thickness of the plate flange, a seaming roll having a forming groove with a cross-sectional shape having at least one circular arc portion, and a cross-sectional shape having at least one circular arc portion. A method of manufacturing a metal container in which a chuck ring having a molding groove is used to tighten the top and bottom plate flanges and the body plate flanges in close contact with each other alternately to form a seam at at least one end of the container body. The radius of curvature of at least one arcuate portion of the groove is 1/ of the sum of the radius of curvature of the arcuate portion of the forming groove of the seaming roll, the thickness of the top and bottom plate flange, and the thickness of the body plate flange.
2, and the center of curvature of the circular arc portion of the forming groove of the seaming roll and the center of curvature of the circular arc portion of the forming groove of the chuck ring are on a common line passing through both centers of curvature at the time of completion of seaming, The seaming roll and chuck ring are arranged so that the distance between both centers of curvature is 1/2 of the sum of the thickness of the top and bottom plate flange and the thickness of the body plate flange, and the seaming roll is oriented toward the chuck ring. The cross-section of the seam section is made up of multiple circular arc parts, forming two sets of concentric circular arc groups whose centers of curvature are shifted from each other, and one end of one circular arc part is connected to the other on a common line passing through the centers of curvature of both concentric circular arc groups. A method for manufacturing a metal container having a seam portion, characterized in that a top and bottom plate flange and a body plate flange are wound and tightened so as to smoothly connect to one end of an arcuate portion of the seaming roll. The forming groove of the chuck ring has a cross-sectional shape of 1/4 arc, and the seaming roll is pushed down toward the chuck ring to form a plurality of semicircular arc parts and a center of curvature of the forming groove of the seaming roll. The method for manufacturing the metal container described above, forming a seam portion having a plurality of quarter arc parts and at least one semicircular arc part centered on the center of curvature of the forming groove of the chuck ring, the cross section of the forming groove of the seaming roll is composed of a first circular arc portion and a second circular arc portion having a radius of curvature smaller than the radius of curvature of the first circular arc portion and following the first circular arc portion, and the cross section of at least one circular arc portion of the forming groove of the chuck ring is smaller than the radius of curvature of the first circular arc portion; It is a circular arc equal to the radius of curvature of the first arc portion of the tightening roll, and the seaming roll is pushed down toward the chuck ring, and the center of curvature of the forming groove of the chuck ring is made equal to the radius of curvature of the first arc portion of the forming groove of the tightening roll. A plurality of circular arc parts including at least one semicircular arc part centered at the center, and a plurality of circular arc parts including at least one semicircular arc part centered at the center of curvature of the second circular arc part of the forming groove of the seaming roll. The manufacturing method of the metal container described above, wherein the forming groove of the chuck ring is close to the seaming roll and has a first arcuate portion equal to the radius of curvature of the first arcuate portion of the seaming roll, and the seaming roll. A method for manufacturing the metal container, wherein the metal container has a second arcuate portion centered on the center of curvature of the second arcuate portion of the seaming roll and larger than the radius of curvature of the first arcuate portion of the chuck ring. The front shell plate flange consists of a straight part and a curved part having at least one radius of curvature and a center of curvature, and the top and bottom plate flange before seaming consists of a straight part and at least one radius of curvature. The dimensions of the top and bottom plate flanges and the body plate flange are the same as the outer tip of the straight part of the top and bottom plate flange when the top and bottom plate are fitted to the body. The distance along the inner surface of the top and bottom plate flange between the outer tip of the straight part of the body plate flange is equal to the distance between the tip of the top and bottom plate flange and the tip of the body plate flange at the end of winding at a preset winding angle. During winding until the end of the predetermined winding angle, which is set in advance so that the relative position of the tip of the body plate flange is equal to the relative position of the two tips at the center of the completed seamed part, the tip of the body plate flange becomes the top plate flange. The dimension is equal to the distance that the top and bottom plate flange moves relative to the top and bottom plate flange along the inner surface of the seam, and before the seaming roll is pressed down against the chuck ring, the tip of the top and bottom plate flange moves along the seaming roll by the preset winding angle. A manufacturing method for the metal container described above, in which a seaming roll is pushed down so as to wind in the forming groove of the top and bottom plate flange, and then both flanges are rolled and tightened until the final seam shape is reached without changing the relative positions of the flanges. and a metal container manufacturing method in which body plate flanges are alternately rolled closely together to form a seam at at least one end of the container body, the curvature diameter being smaller than the desired outer diameter of the seam at the initial stage of seaming. Forming the center of the desired seam at the tips of the top and bottom plate flanges and the body plate flange using a seaming roll having a forming groove with a radius of curvature;
Subsequently, both of the following flanges are wrapped and tightened around the outside of the center using a tightening roll having a forming groove with a radius of curvature larger than that of the tightening roll, and the outside of the seam portion is sequentially formed to form the desired shape. A method for manufacturing a metal container having a seam, the method comprising forming the seam.

The plurality of metal plates constituting the seam part are a top plate flange and a body plate flange constituting the seam part, and both flanges are each a single metal plate, a plurality of metal plates, or a single or plural metal plates. and a plate other than metal.

For metal containers such as drums, particular emphasis is placed on handling, drop resistance during transportation, and leakage resistance.
If the container is damaged during this fall, the seam portion will bend and deform, and if the strength of the seam portion is insufficient, the contents will leak. Normally, the deformation of the seam portion when the drum falls is a torsional bending deformation in which the center of bending is in the direction of the longitudinal axis of the drum, and the seam portion bends inward. Therefore, for example, in a conventionally known elliptical seam, the bending stress generated is inversely proportional to the moment of inertia about the long axis, and if the moment of inertia about the short axis of the ellipse, which is efficient for bending deformation strength, acts effectively, few. This also applies to rectangles and oval shapes.

The seam portion of the present invention is composed of a plurality of continuous circular arcs in a cross section obtained by tightly and alternately wrapping metal plates in two types of concentric arc shapes having two common centers, and is symmetrical about the midpoint of the two common centers. Since the metal plate is configured symmetrically with respect to the center, the metal plate is uniformly adhered in a concentric arc shape at the center of the seam, and the gap (filled with sealing compound) in the center is small, and the seam of the container It is most efficient against bending deformation. Therefore, the amount of metal plates (usually the body plate and the top plate or the base plate) constituting the seam portion and the amount of sealing compound used can be extremely reduced. In addition, when the metal plates are made of the same amount, the strength against the bending deformation that normally occurs is superior to that of the conventionally known seam portion.

According to the manufacturing method of the present invention, the plurality of metal plates constituting the seam portion, for example, the top and bottom plates and the body plate, are formed into a plurality of continuous circular arcs along the single or plural circular arcs of each of the forming grooves of the seaming roll and the chuck ring. molded,
Two types of continuous concentric arc groups are formed by two centers whose center distance is 1/2 of the sum of the thicknesses of the top and bottom plates and the body plate, and formed into a point-symmetric shape with the midpoint of the two centers as the center of symmetry. Therefore, the inner surface of the top and bottom plates formed along the forming grooves of the seaming roll and chuck ring, the outer surface of the body plate formed along the inner surface of the top and bottom plates, and the outer surface of the top and bottom plates and the inner surface of the body plate are always the same. It is continuously formed to have the same radius of curvature, and the seaming is extremely smooth and easy, and the adhesion between both sides is uniform and no voids are formed. Furthermore, before the start of seaming, the lengths of both flanges of the metal plates forming the seam portion during temporary fitting can be accurately and easily theoretically calculated and set. In conventionally known manufacturing methods, both flanges deform irregularly, making it impossible to theoretically calculate the length of both flanges.As a result, the center of the seam becomes irregular and the close contact between both flanges becomes irregular. A void is created.

Furthermore, in the seam manufacturing method of the present invention, in the initial stage of seaming, a first seaming roll is provided with a forming groove having a cross-sectional curve with a radius of curvature smaller than a desired radius of curvature on the outside of the seam. Thus, the center of the desired seam, or a seam smaller than the desired seam including the center, is formed, followed by a forming groove equal to the outer shape of the desired seam, or a first
A second seam roll having a forming groove with a curved cross section formed with a radius of curvature larger than that of the seam roll forms the following flanges at the center of the seam part or at the outside of the seam part smaller than the desired seam part. This is a method of wrapping and tightening to form a desired seam part, or a method of forming a desired seam part larger than the seam part from a seam part smaller than the desired seam part. A central part is formed, and both flanges that follow around the central part are alternately formed into two continuous groups of concentric arc parts, and into a point-symmetric shape with the center of symmetry being the midpoint of the two centers of the groups of concentric arc parts. In order to tighten the seam, both flanges that make up the seam part come into close contact with each other, and the seaming process is extremely smooth and easy. does not undergo substantial deformation during seaming. Therefore, before starting seaming, the length of the metal plates (both flanges) forming the seam part during temporary fitting, the straight part, the curved part, etc. can be calculated and set theoretically accurately and easily. Moreover, both flanges are easily and extremely evenly attached. In addition, during temporary fitting, the body plate flange can be set to have a straight portion in both the pushing direction of the seaming roll and the direction parallel to the can axis, which makes the temporary fitting strong and eliminates the risk of falling off. There is little risk that the top and bottom plate flanges will buckle under the pressure of the seaming rolls. Further, according to the seam manufacturing method of the present invention, seam parts of various winding layers or winding angles can be manufactured using various rolls or only two seaming rolls.
Furthermore, the lengths, straight portions, curved portions, etc. of both flanges constituting the seam portion during temporary fitting to the various seam portions can be accurately and easily theoretically calculated and set. In the conventionally known seam manufacturing method, in order to manufacture the various seams, various separate seaming rolls are required for each seam, and both flanges constituting the seam during temporary fitting are required. length,
Straight sections, curved sections, etc. cannot be calculated theoretically. This is due to the fact that in the conventionally known seam manufacturing method, the metal plates that make up the seam deform irregularly during seaming, resulting in the shape of the seam and the internal shape of the seam being unstable, irregular, and This is due to the drawback that it is difficult to always obtain the same shape.

Next, the seam portion and manufacturing method of the present invention will be explained with reference to the drawings.

FIG. 3 is an explanatory cross-sectional view showing an example of the seam part of the metal container of the present invention, in which 1 is a flange of the top and bottom plates forming the seam part, 2 is a flange of the body plate forming the seam part, and 1' and 2' are the parts of the top and bottom plate body and the body plate body (container body) that are parallel to the axis of the container following the top and bottom plate flange 1 and the body plate flange 2, respectively;
and 4 is the common center of the tip side of the top and bottom plate flanges and the tip side of the body plate flange of the concentric arc group around which both flanges 1 and 2 are wound, respectively; 5 is the sealing compound filling part in the center of the seam part; 6 is a straight line passing through the two common centers 3 and 4, 7 and 8 are straight lines perpendicular to the axis of the container and passing through the two centers 3 and 4 of the two concentric arc groups, 9 is the maximum layer of the seam and the straight line The outermost layer of the largest layer sector (3 in the center) on the container side of the seam sandwiched by straight lines 6 and 7, 10
is the outermost layer of the fan-shaped portion (the center is 4) on the side opposite to the container of the seam portion sandwiched by the straight lines 6 and 8 and does not include the straight line 7, and 11 is the smallest part of the seam portion and Indicates the smallest sector of the container side of the seam that will be sandwiched between.

12' and 13' indicate the lower ends of the seaming roll 14, and a vertical wall can be attached following the forming groove R of the seaming roll 14. In this case, 12' and 13' do not coincide with the straight line 6. Approach the container body,
The upper end of the chuck ring corresponding to the seaming roll 14 can be made into a fillet.

The tip of the flange 1 of the top and bottom plate is wound at an angle of 630° to the axis of the container, and the tip of the body plate flange 2 is wound and tightened at an angle of 450° to the axis of the container, forming a seam between both flanges 1 and 2. The part is a semicircular gap in the center of the seam (filled with sealing compound)
They are tightly wound and tightened alternately, except for. In Fig. 3, the plate thicknesses of both flanges 1 and 2 are shown as being the same, and a group of concentric circular arcs below the straight line 6 having the center 3 as a common center and concentric circular arcs above the straight line 6 having the center 4 as the common center. form two substantially continuous concentric arc groups with the group, and the concentric arc groups are
formed by a circular arc portion having a central angle of 180° and a circular arc portion having a central angle of 90°, having two common centers 3 and 4 of the group of concentric circular arcs, and having the common center 3
and 4 have a center distance of 1/2 of the sum of the plate thicknesses of both flanges of the top plate or base plate and the body plate, and the center of the plate thickness at the tip of the top plate flange 1 and the tip of the body plate flange 2, respectively. be. Also, the minimum radius of curvature of the concentric arc group formed by both flanges 1 and 2 is the top and bottom plate flange 1.
Alternatively, the minimum radius of curvature at the center of the plate thickness is 0.5 times the plate thickness of the body plate flange 2 and 1.0 times the plate thickness. The seam portion is formed by two continuous groups of concentric circular arcs in which the flanges 1 and 2 are tightly and alternately wound together, and a straight line 6 passing through the two centers 3 and 4 of the concentric circular arc groups is formed. , the straight line 6 is parallel to the axis of the container, and the shape of the seam is partially but mostly centered around the midpoint of the centers 3 and 4, except for the outermost portions 9 and 10 of the seam. It is a point-symmetric shape with the center of symmetry. The centers 3 and 4 of the two concentric arc groups constituting the seam portion have a center distance on the straight line 6 that is half the sum of the thicknesses of the top and bottom plate flanges and the body plate flange. The center 3 of the group of concentric arcs is the center of the group of concentric arcs at the seam portion on the container side with respect to the straight line 6;
The center 4 of the group of concentric arcs is the center of the group of concentric arcs at the seam portion on the opposite side of the container with respect to the straight line 6.
Since the seam shown in Figure 3 has two common centers and is tightened in a continuous concentric arc shape, the required lengths of both flanges 1 and 2 that make up the seam are accurately and theoretically calculated. You can. In other words, the length of the plate thickness center line from the straight part 1' of the top and bottom plate flange to the tip is (Thickness of the top and bottom plate flange) x 8π The length of the plate from the part bent from the straight part 2' of the body plate flange to the tip The length of the thickness center line is (thickness of shell plate flange) x 4.5π.

The seam shown in FIG. 3 is an example of the seam of the present invention, and in the seam of the present invention, the winding angle of the tips of both flanges and the two types of concentric arcs of the plurality of metal plates constituting the seam are different. It is not restricted by the minimum radius of curvature of the group, the thickness of the metal plate, etc. In Fig. 3, the plate thickness of the top plate flange and the plate thickness of the body plate flange are made equal, but the seam part of the present invention is constrained by the plate thickness of both flanges constituting the seam part or the difference between the two plate thicknesses. It is not something that will be done. Even if the plate thicknesses of both flanges are different, they can be constructed similarly, and in this case, the two centers of the two types of concentric arc groups are not the center of plate thickness at the tips of both flanges.

In general, damage to the seam of a metal container that has a seam occurs when the container is dropped, especially when the container is dropped diagonally in a diagonal direction. The boundary between the seam and other parts undergoes torsional bending, and at the boundary, the seam part is formed by the outermost layer 9 at the maximum part of the seam part, the top plate flange part 1', the minimum part 11 of the seam part, and the flange part of the body plate. 2 and 2' are often separated. The seam portion according to the present invention as shown in FIG. 3 has strong resistance to peeling as described above,
The entire circumference of the group of concentric circular arcs of the metal plates constituting the seam portion resists, and each layer of the seam portion resists peeling of the minimum portion 11 of the seam portion over the entire circumference of the seam portion. Furthermore, the strength is approximately uniform in all directions of the seam at the portion of the seam that is subject to torsional bending, which is the weakest point of the seam. Furthermore, against an object impact at the portion 10 of the seam section extending from the straight line 6 to the straight line 8, where the maximum impact occurs during a fall, both flanges constituting the seam have extremely high resistance to the peeling due to the tight winding. The resistance to twisting and bending is extremely large, both in the direction of tightening and in the direction of loosening. The gap in the center of the seam is between both flanges 1 and 2 that make up the seam.
The minimum radius of curvature at the center of the seam of the group of concentric arcs is 0.5 times the thickness of the top and bottom plate flange 1 or the body plate flange 2 in the seam illustrated in FIG. The external shape of the seam part is ideally small compared to the winding angle and the number of seam layers, and the amount of sealing compound filled in the gap at the center of the seam part and the flanges 1 and 2 constituting the seam part. Also ideally in small amounts.

FIGS. 4 to 8 are explanatory cross-sectional views showing other examples of the seam portion of the present invention.

The seam shown in FIG. 4 is an example of the seam of the present invention in which the straight line 6 passing through the centers of the two concentric arc groups is inclined at 45 degrees with respect to the axis of the container in the direction opposite to the seaming direction. The winding angles of the tip of the top plate flange 1 and the tip of the body plate flange 2 with respect to the container axis are 585° and 405°, respectively. 1 to 1 in Figure 4
1, 12', 13', 14 and R have the same meaning as in FIG. 3, and 12 is the center of the plate thickness at the tip of the top and bottom plate flange 1, and is the common center of the group of concentric arcs at the seam part on the container side from the straight line 6. The line 13 is the center of the plate thickness at the tip of the flange of the body plate, and is the common center of the group of concentric arcs at the seam on the opposite side of the container from the line 6. a certain center 4
A straight line passing through and parallel to the container axis, indicated by a dashed line, 1
2' and 13' are the lower ends of the forming groove R of the seaming roll 14, 15 and 15' are the centers of the radius of curvature of the arcuate grooves of the seaming chuck ring corresponding to portions 9 and 10 of the seam portion, and 16 is the center of the radius of curvature of the arc groove of the seaming chuck ring. Two continuous arcs having two centers 15 and 15' whose center distance is 1/2 of the sum of the plate thicknesses of the top and bottom plate flange and the body plate flange corresponding to the forming groove R of the seaming roll in the forming groove of the chuck ring. 17 is the upper end of the chuck ring corresponding to the lower end 13' of the seaming roll;
8 indicates a groove bottom which is continuous with the groove 16 of the chuck ring. The lower ends 12' and 13' of the seaming roll 14 and the upper end 17 of the chuck ring are shown as an example, and a vertical wall can be provided following the forming groove R of the seaming roll 14, and in this case, 12' and 13' do not coincide with the straight lines 12 and 13, respectively, but approach the container body body, and can fillet the upper end 17 of the chuck ring corresponding to the seaming roll 14.

The seam portion is partially off-center except for the outermost layer portions 9 and 10, but most of the seam portion is point symmetrical with the midpoint between centers 3 and 4 as the center of symmetry. The characteristics of this seam part are that its strength and resistance to peeling are inferior to the seam part explained in FIG. , has a resistance force, and the size of the seam portion is smaller as the number of turns is smaller, so that the required amount of both flanges 1 and 2 constituting the seam portion is smaller. Other conditions for the seam are the same as those for the seam described in FIG. The manufacturing method for this seam part is slightly different from the seam part shown in FIG. 3, but will be described later in the description of the manufacturing method.

In the seam portion shown in FIG. 4, the straight line 6 has an inclination angle of more than 90° to less than 180° or more than 0° to less than 90° with respect to the container axis, and the winding angle of both flanges 1 and 2 with respect to the container axis These are representative examples of seam portions of the present invention in which angles range from less than 630° to more than 540°, and from less than 450° to more than 360°.

The seam shown in FIG. 5 is an example of a seam in which a straight line 6 passing through the two center lines of the two concentric arc groups is perpendicular to the axis of the container. The winding angles of both ends of the flanges of the top and bottom plates and the body plate with respect to the axis of the container are 540° and 360°, respectively. This seam part has a point-symmetric shape with the center of symmetry being the midpoint of centers 3 and 4, except for the outermost layer 10 of the seam part on the left side of the figure from the straight line 6. The feature of this seam part is the limit of so-called 7-layer winding (triple seam), and the other conditions are almost the same as the seam part explained in Fig. 4A, and straight lines 7 and 8 are straight lines 6
matches.

FIG. 6 shows an example of a seam portion of the present invention in which the straight line 6 is inclined at 135 degrees in the direction opposite to the seaming direction with respect to the axis of the container. The winding angles of both ends of the top and bottom plate flange 1 and the body plate flange 2 with respect to the container axis are respectively
495° and 315°, the angle of inclination of the straight line 6 to the container axis is less than 90° to more than 0°, or more than 90° to less than 180°, and the winding angle is less than 540° to more than 450°, and 360°, respectively. less than~
This is a representative example of a seam portion with an angle of more than 270°. This seam part, except for the outermost layer parts 9' and 10', has a point-symmetric shape with the center of symmetry centered at the midpoint of centers 3 and 4, and is symmetrical with respect to the seam parts of FIGS. 3 and 4. The positions of the straight lines 7 and 8 are different. Therefore, 9' is the outermost layer of the largest layer fan-shaped part (center is 4) on the side of the container at the seam between straight lines 6 and 8, and 10' is the container at the seam between straight lines 6 and 7. On the opposite side, it is the outermost layer of the fan-shaped section (centered at 3) that does not include the straight line 8. The characteristic of this seam part corresponds to the seaming tightening between the so-called 7-layer winding (triple seam) and 5-layer winding (double seam), and the other conditions are the 4th seam.
It is substantially the same as the seam portion explained in Figure A, and is useful depending on the application.

FIG. 7 shows another example of a seam portion of the present invention in which the straight line 6 is parallel to the axis of the container, similar to the seam portion shown in FIG. The winding angles with respect to the container axis are 450° and 270°, respectively, and are examples of seam portions corresponding to so-called five-layer winding (double seam). This seam part differs in winding from the seam part shown in FIG. It is useful as a layered winding depending on the purpose.

FIG. 8 shows a fourth seam portion of the present invention in which the straight line 6 is inclined at an angle of 45° with respect to the axis of the container as a representative example of a seam portion having an inclination angle of more than 0° to less than 90° in the direction opposite to the seaming direction. This is another example similar to the seam shown in the figure. The winding angles of both ends of the top and bottom plate flange 1 and the body plate flange 2 with respect to the axis of the container are 405° and 405°, respectively.
225°, the winding angle is less than 450° to more than 360°, and
This is a typical example of a seam portion having an angle of less than 270° to more than 180°, and is close to the limit of a so-called five-layer seam portion. If the winding angle 225° at the tip of the shell plate flange 2 is further reduced, the resistance to peeling between the minimum portion 11 of the seam portion and the straight portion 2' of the shell plate flange becomes weaker, but the seam portion is similar.

As illustrated in FIGS. 3 to 8, the seam portion of the present invention can have any winding angle, number of winding layers, etc. of the seam portion, and is not restricted by the winding angle, winding layers, etc.

Figure 9 shows that in the seam part of the present invention, the minimum radius of curvature of the two types of concentric arc groups is 1.0 times the thickness of the top and bottom plate flanges or the body plate flange, and the minimum radius of curvature at the center of the plate thickness is 1.5 times the plate thickness. This is a cross-sectional view of an example of a seam portion that is double the thickness of the seam portion.The seam portion shown in FIG. 9 is similar to the seam portion shown in FIG. Seams similar to those shown in FIGS. 4-8, which are 1.0 times larger, can be constructed.

Figure 10 shows that in the seam part of the present invention, the minimum radius of curvature of the two types of concentric arc groups is 0.3 times the thickness of the top and bottom plate flanges, and the minimum radius of curvature at the center of the plate thickness is
An example is shown in cross section at the seam section at 0.8x. Among the seam parts of the present invention, the seam part shown in FIG. 10 is similar to the seam part shown in FIG. 3, and similarly, the seam part shown in FIGS. A seam similar to that shown can be constructed.

The seam portion of the present invention is not limited to the minimum radius of curvature of the two types of concentric arc groups. However, making the minimum radius of curvature less than 0.5 times the thickness of the flange of the top and bottom plates involves manufacturing difficulties. On the other hand, making the minimum radius of curvature 1.0 times or more the plate thickness makes manufacturing easier, but the seam becomes larger, and the lengths of flanges 1 and 2 of the top and bottom plates and body plate that make up the seam, the seam This method has drawbacks such as a large amount of sealing compound being filled in the center of the section.

In the seam portion shown in FIGS. 3 to 8, the radius of curvature of the circular arc portion at the tips of both flanges 1 and 2 at the center is 1.0 times the plate thickness at the plate thickness center line, and therefore the minimum radius of curvature is The inner radius of curvature is 0.5 times the plate thickness. Generally, in bending where the radius of curvature is smaller than the plate thickness, the plate thickness of the formed part may increase after forming. Therefore, in the present invention, the radius of curvature of the circular arc portion at the center of the seam portion is set in consideration of the amount of increase in plate thickness after forming.
Alternatively, the plate thickness of the circular arc portion having the minimum radius of curvature can be reduced by appropriate means such as cutting and grinding according to the amount of increase in plate thickness before and after forming.

Next, an apparatus and method for manufacturing a metal container having a seam portion according to the present invention will be explained with reference to the drawings.

Figures 11 to 16 show the third seam portion of the present invention.
FIG. 9 is an explanatory view showing an example of the main curves of the cross section of the forming groove of the seaming roll of the present invention for the seam example shown in FIGS.
It is basically the same as shown in 13' and 14. 3', 4', 6' in Figures 11 to 16,
7' and 8' are 3, 4, and in Figures 3 to 8.
6, 7 and 8. Chuck rings corresponding to the seaming rolls are illustrated at the bottom of FIGS. 11, 4, 5, and 8. Figure 12~
The forming grooves of the seaming roll shown in Figs. 14 and 16 and the forming grooves of the chuck ring illustrated in Figs. 4 and 8 are 1/2 of the sum of the thicknesses of the plurality of metal plates constituting the seam part. It is composed of two consecutive circular arcs having two centers with a center distance of is 1/2 of the sum of the thicknesses of the metal plates.

As is clear from FIGS. 3 to 16, the seaming roll and chuck ring of the present invention are arranged between at least one center of curvature among the single or plural centers of curvature in the cross-sectional curve of both forming grooves. The distance is set so that when seaming is completed, it becomes 1/2 of the sum of the thicknesses of the plurality of metal plates forming the seam portion.

For the seam parts shown in Figures 3, 7, 9, and 10, the cross-sectional curves of the seaming roll and chuck ring are both one arc, and the centers of curvature of both are at the seam in the figures. The horizontal center distance is 1/2 of the sum of the thicknesses of the metal plates that make up the section. For the seam shown in FIG. 5, the centers of curvature 3, 4 and 15 of both cross-sectional curves are on a straight line perpendicular to the container axis in the figure, and the center 4 when seaming is completed.
coincides with center 15, and the center distance between center 3 and center 15 is 1/ of the sum of the thicknesses of the metal plates constituting the seam part.
It is 2.

For the seam portions shown in FIGS. 4, 6, and 8, both centers of curvature 3, 4 and 15, 15',
Or 4 and the center of curvature of the chuck ring molding groove 1
5, or 4, 3 and 15, 15' are located correspondingly on a straight line perpendicular to the container axis, and when the seaming is completed, 3, 3 and 15, 15' are respectively located.
4 and 15, 15' or 4 and the center of curvature of the forming groove of the chuck ring, or 4, 3 and 15, 15' coincide, and 3 and 15', 4 and 15, 3 and the center of curvature of the forming groove of the chuck ring, respectively. , 3 and 15, 4 and 15'
The center distance of is 1/2 of the sum of the thicknesses of the metal plates that make up the seam. The relative positions of the seaming roll and chuck ring of the present invention are set as described above.

As is clear from FIGS. 3 to 10, the cross-sectional curves of the forming grooves of the seaming roll and chuck ring shown in FIGS. The inner radius of curvature of the arc part (minimum radius of curvature of the seam part)
And, the above conditions are satisfied by one or more circular arcs with a radius of curvature of more than 0° and less than 180°, whose radius of curvature is the sum of the multiple of the plate thickness of the top and bottom plate flange and the multiple of the plate thickness of the body plate flange. It is configured. The radius of curvature and central angle of the arc can be appropriately determined under the above conditions depending on the desired seam portion or desired manufacturing method.

The seaming roll shown in Figs. 4 and 8 consists of a first arc having a central angle of more than 90° in cross section and a second arc continuous to the arc, and the sum of the central angles of both arcs is It is 180°.

In FIGS. 11 to 16, the solid line is the cross-sectional curve of the forming groove, the dashed-dot line is the center line indicating the center of curvature of the cross-sectional curve and the boundary of curves with different radii of curvature within the curve, and the broken line is the solid line. Other examples of cross-sectional curves, particularly examples of vertical walls that can be provided before and after the forming grooves of the seaming rolls, fillets that can be provided at the lower ends of the rolls, and chuck rings are shown.

For the seam portions shown in FIGS. 9 and 10, the seaming roll and chuck ring used to manufacture a series of seam portions having different radii of curvature similar to the seam portions shown in FIGS. 4 to 8 are Figure ~ No. 16
Each cross-sectional curve of the forming groove can be set similarly to the seaming roll and chuck ring shown in the figure.

The seaming roll shown in Fig. 17 is the first seaming roll whose radius of curvature is the sum of the thickness of the top and bottom plate flange, the thickness of the body plate flange, and the minimum radius of curvature of the top and bottom plate flange at the seam part, and the center angle is A formed groove consisting of a circular arc with a radius of 90 degrees, a radius of curvature equal to the sum of the plate thickness of the top and bottom plate flanges that are continuous with the arc, and the minimum radius of curvature of the top and bottom plate flanges at the seam portion, and a circular arc with a center angle of 90 degrees. has. The one-dot chain line indicates the center of each radius of curvature.The distance between the two centers is 1/2 of the sum of the plate thicknesses of the top and bottom plate flanges and the body plate flange. Alternatively, it may be shown by a solid line and a broken line.

FIG. 18 is an explanatory diagram illustrating, in cross section, the temporarily fitted state before the start of seaming in the method for manufacturing a metal container having a seam portion according to the present invention, and corresponds to the manufacturing of the seam portion shown in FIG. 3 above. .

The top and bottom plate flange 1 passes through a part 1' parallel to the container axis, and the length of the plate thickness center line from the point where it bends from 1' to the tip is relative to the seam part in Fig. 3 (the thickness of the top and bottom plate flange). ) x 8π, the radius of curvature of the center line of the curved part from 1' is (thickness of the top and bottom plate flange) x 4, and the length of the straight line perpendicular to the container axis is (thickness of the top and bottom plate flange) x 5.5π , the tip is bent 90 degrees from the straight line perpendicular to the container axis to the minimum radius of curvature of the top and bottom plate flange at the seam, that is, the third seam, with a radius of curvature equal to the plate thickness at the center line. The parts can be set to form an arc with a central angle of 90°. The arc at the tip of the top and bottom plate flanges can be formed during press molding of the top and bottom plates. Alternatively, during temporary fitting, the tip can be made straight and formed using an end bending roll of a seaming machine or another end bending machine.

The body plate flange 2 is connected to a part 2' parallel to the container axis, and the length of the plate thickness center line from the point where it bends from 2' to the tip is relative to the seam part in Fig. 3 (the plate of the body plate flange). thickness) x 4.5π, the radius of curvature of the center line of the curved part from 2' is (thickness of the shell plate flange) x 13.95, the length of the straight part perpendicular to the container axis is (thickness of the shell plate flange) )×3.18.

For the seam portions shown in FIGS. 4 to 10, the required dimensions of each portion can be similarly calculated and set theoretically. In reality, in order to tighten or loosen the seam, and to take into account variations in the thickness of the metal plate used, the theoretically calculated dimensions are changed appropriately to obtain the desired seam overall. Can be set. The length of the plate thickness center line from the point where the top and bottom plate flange bends from 1' to the tip is determined by the desired seam, and the radius of curvature of the center line of the bend from 1' is determined by the material of the top and bottom plate flange and The length of the straight portion perpendicular to the container axis and the dimensions of each part of the body plate flange can be determined and set appropriately by a molding method.

In FIG. 18, the starting point on the left side of the diagram of the circular arc with the center angle of the tip of the top and bottom plate flange 1 of 90° coincides with the starting point on the left side of the diagram of the forming groove of the first seaming roll shown in FIG. 17, and The seaming roll shown in FIG. 17 is set so that the lower edge of the seaming roll shown by the one-dot chain line coincides with a straight line parallel to the container axis shown by the one-dot chain line at the tip of the top and bottom plate flange 1 in FIG. 18. The roll is pushed down perpendicularly to the axis of the container, and the tip of the top and bottom plate flange 1 is tightly wound by 180° from the starting point of the roll. During the winding, an appropriate amount of sealing compound can be sprayed and adhered to the tip of the top and bottom plate flange and its vicinity at an appropriate time. The state after the pressing down process of the roll or after the winding is the 19th state.
As shown in the cross section in the figure, the tip of the top and bottom plate flange 1 is wound 180 degrees from the tightening start point, and at the same time, the tip of the body plate flange is tightened and wound 90 degrees, and the tip of the body plate flange 2 is At the center line, an arc with a radius of curvature equal to the thickness of the flange 2 of the body plate and a center angle of 90° is formed, and the outside of the arc is the flange 1 of the top and bottom plate.
The tip of the body plate flange fits inside the arc with a center angle of 90° formed on the top of the top plate flange 1.
It fits in contact with a straight line connecting both starting points inside the semicircle formed at the tip of. The fitting results from the relative positions of the top and bottom plate flange 1 and the body plate flange 2 during temporary fitting as shown in FIG.
The relative positions of the two flanges 1 and 2 shown in FIG.
The 90° arcs are fitted as described above, and the inside of the semicircle at the tip of the top and bottom plate flange is set to fit with the tip of the body plate flange. In FIG. 19, the relative positions of the tips of both flanges are equal to the relative positions at the desired seam, and the tips of both flanges form the center of the desired seam.

Following the tightening winding shown in FIG. 19, the tightening rolls shown in FIGS. The starting point on the left side of the figure) and the lowest edge of the forming groove are connected to a straight line perpendicular to the container axis of the flange 1, which is an arc with a center angle of 90° on the outside of the top and bottom plate flange 1 shown in Fig. 19. Set so as to match the starting point and the straight line shown by the dashed line, press down and sew, and both flanges 1 and 2 are formed into a plurality of circular arc parts having a center angle of 180° and a plurality of arcuate parts having a center angle of 180° or less in the cross section. or a plurality of circular arc parts having a central angle of 180°, and the circular arc parts are formed into both flanges 1 and 2.
Two types of continuous concentric arc parts are formed by two centers whose center distance is 1/2 of the sum of the thicknesses of The seam portion shown in FIGS. 3 to 8 can be manufactured by forming the seam part into a point-symmetric shape with the midpoint between the two centers as the center of symmetry.

In the example of the manufacturing method of the present invention explained in FIGS. 18 and 19, the center of the seam is formed at the initial stage of seaming, and then the second seam roll corresponding to the desired seam is used. This figure shows an example of a method of forming a desired seam portion by wrapping and tightening both subsequent flanges around the center portion.

When the seam parts shown in FIGS. 3 to 8 are each manufactured using one seaming roll, the temporary fitting conditions illustrated in FIG. 18 are such that the body plate flange 2
The length, shape, relative position, etc. of both flanges 1 and 2 are calculated and set appropriately so that the tips of both flanges 1 and 2 fit inside the semicircle formed at the tip of top and bottom plate flange 1, and both flanges 1 and 2 in cross section
It is formed into a plurality of circular arc parts having a central angle of 180°, or into a plurality of circular arc parts having a central angle of 180° or less, and the circular arc parts are formed into a plurality of circular arc parts having a central angle of 180° or less, and the circular arc parts are formed into Two types of continuous concentric arc groups are formed by two centers with a center distance of 1/2, and a straight line passing through these two centers reaches a desired angle of inclination with respect to the container axis and has the desired winding and winding layers. It can be manufactured by tightening it until it reaches the desired point, and molding it into a point-symmetrical shape with the center of symmetry being the midpoint between the two centers, except for a part.

When manufacturing the seam portions shown in FIGS. 3 to 8 using two seaming rolls, as illustrated in FIG. When wound, the arc with a center angle of 90° at the tip of the body plate flange 2 is in close contact with the arc with a center angle of 90° following the semicircle at the tip of the top and bottom plate flange 1,
The temporary fitting conditions are set so that the tip of the body plate flange 2 fits inside the semicircle of the tip of the top and bottom plate flange 1, and as explained above, the desired sealing is performed using various second seaming rolls. Seams can be formed.

In the method of manufacturing a metal container having a seam according to the present invention, the arc formed to have a center angle of 90° at the tip of the top and bottom plate flange 1 in FIG. 18 is formed to have a center angle of 0° to 180°. It can be made into a circular arc. Even when forming an arc with a center angle of 0° to 180°, the temporary fitting conditions for temporary fitting can be easily calculated theoretically. By setting the winding angle of 180° to 270° to 90° corresponding to the central angle of the arc of 0° to 180°, the temporary fitting conditions can be set so that the winding can be tightened to the state shown in Figure 19. , and subsequent seaming is the same as the method described above.

FIG. 20 is an explanatory diagram illustrating temporary fitting conditions in another example of the method for manufacturing a metal container having a seam portion shown in FIG. The radius of curvature, ie, the center line of the plate thickness with respect to the seam portion in FIG. 3, forms an arc with a center angle of 180° in the cross section at the radius of curvature of the plate thickness. The arc can be properly formed by a conventionally known method before temporary fitting, but it can also be formed after temporary fitting with an end bending roll or other roll using a seaming machine.

Next, the tip of the top and bottom plate flange 1 is tightened by the seaming roll shown in FIG.
Tighten until the winding is 180°. FIG. 21 shows the state at the end of the seaming. This state is an example of the first stage of seaming in the manufacturing method of the present invention, similar to the state illustrated in FIG. 19 in the manufacturing method described above,
The sealing compound can be injected at an appropriate time during the seaming process, and the gap at the tips of both flanges 11 and 2 can be filled with the sealing compound in the state shown in FIG.

Subsequently, the seam portion shown in FIG. 3 can be manufactured by tightening with a seaming roll shown in FIG. 11. In this method, the temporary fitting conditions shown in Fig. 20 are set appropriately, and the seaming rolls shown in Fig. 15 are used to start the seaming until the tip of the top and bottom plate flange 1 is wound by 135 degrees, and then the seaming is completed as shown in Fig. 8. The seam shown in can be manufactured. Further, by using the seaming roll shown in FIG. 15 to tighten the end of the top and bottom plate flange 1 until it has been wound by 180 degrees and completing the seaming, the seam shown in FIG. 7 can be manufactured.

As in the case of manufacturing the seam portion shown in FIG.
The state shown in Figure 1 is then tightened with the tightening roll shown in Figure 11. If the winding angle from the start of tightening at the tip of the top and bottom plate flange 1 is 225°, the tightening is completed.
Similarly, if you complete the seaming at 270°, you will see the seam in Figure 5. If you complete the seaming at 315°, you will see the seam in Figure 4. When completed, the seam portion shown in FIG. 3 will be manufactured. Similarly, the 11th
If the seaming rolls shown in Figures 12 to 14 are used instead of the seaming rolls shown in the figure, the seams shown in Figures 4 to 6, Figure 5, Figure 6, and Figure 6 can be formed respectively. I can do it. FIG. 22 is an explanatory diagram illustrating the case where the seam portion shown in FIG. 5 is formed by the seaming roll shown in FIG. 11, and the symbols are the same as those in the previous figures. In order to obtain the desired seam portion upon completion of each of these seams, the temporary fitting conditions shown in FIG.
Figure 0 is a view of the seam part in Figure 3.) It is sufficient to set appropriate conditions for each seam part, and it is easy to calculate these conditions and set the temporary fitting conditions appropriately. In the case of temporary fitting in which an arc with a center angle of 180° is formed at the tip of the top and bottom plate flange shown in Fig. 20, the temporary fitting conditions of the body plate are changed, and the tip of the top and bottom plate flange is tightened with the seaming roll shown in Fig. 17. From the start of seaming, the seam is wound 90 degrees to obtain the state shown in FIG. 19, and thereafter a desired seam portion can be manufactured in the same manner as explained in FIGS. 18 and 19.

The manufacturing method of the present invention explained in FIGS. 20 and 21 forms the center part of the seam part during the closing period, and then forms the forming groove with a cross-sectional curve having a radius of curvature larger than that of the first seaming roll. This is an example of the manufacturing method of the present invention in which a seam portion is completed with various windings using one second seaming roll and various desired seam portions are formed using two seaming rolls. Since the seam portion of the present invention is constituted by two types of concentric arc portion groups, the cross-sectional curvature radius of the forming groove of the second seaming roll is the cross-sectional curvature radius of the forming groove of the first seaming roll. If the diameter is larger than the radius, the second seam roll can form all kinds of windings and seam portions of winding layers with an outer diameter smaller than the forming groove of the second seam roll.

In the same way as the method explained in FIGS. 18 to 21, as a first step, the seam shown in FIG. 8 is formed at the tips of both flanges by the seaming roll shown in FIG. 16, and then in the second step. The seam portions shown in FIGS. 3 to 7 can be formed using the seaming rolls shown in FIGS. 11 to 15. Or Figure 11 ~
By the seaming roll shown in FIG. 15, each of the
Figure 7, Figures 4 to 7, Figures 5 to 7, Figure 6
The seam shown in FIGS. 7 and 7 can be formed. Similarly, as the first step, Figure 4~
The seams shown in FIGS. 4 to 6 are formed at the tips of both flanges using the seaming rolls shown in FIGS. 6 and 12 to 14, and then, as a second step, the seams shown in FIGS. The seam portions shown in FIGS. 3 to 5 can be formed by the seaming rolls shown in FIGS. 5 and 11 to 13. For example, if the seam shown in FIG. 6 is formed in the first stage, the seam part shown in FIGS.
The seam shown in FIG. 5 or the seams shown in FIGS. 3-5, 4 and 5, 5, respectively, can be manufactured. In the case where the seam portions shown in FIGS. 5 and 4 are formed in the first step, the seam portions shown in FIGS. 4, 3, and 3 can be formed in the second step in the same manner.

According to the method of manufacturing a metal container having a seam portion of the present invention, each desired seam portion can be manufactured using only two types of seaming rolls, and each seam portion can be manufactured using various windings and winding layers. It is possible to manufacture different seam parts in succession, and when changing a desired seam part, it can be changed very efficiently.

The method of manufacturing a metal container having a seam portion according to the present invention uses the seaming roll and chuck ring illustrated in FIGS. The length is theoretically calculated and set for the desired seam part, and both flanges 1 are temporarily fitted, supported by a chuck ring, and rotated while pushing down the seaming roll.
and 2 into a plurality of circular arc parts having a central angle of 180° in a cross section, or into a plurality of circular arc parts having a central angle of 180° and a plurality of circular arc parts having a central angle of 180° or less, and The arc part is formed into two types of continuous concentric arc part groups with two centers whose center distance is 1/2 of the sum of the plate thicknesses of the top plate or base plate and the body plate, and with the exception of a part, This is a method of forming into a point-symmetric shape with the center of symmetry as the center of symmetry, and the surfaces of the corresponding top and bottom plates and body plate are continuously formed so that they always have the same radius of curvature, and the forming is extremely smooth. It is easy to do so, and the surfaces of the top and bottom plates and the body plate are evenly bonded and no voids are formed.

In the manufacturing method of the present invention, for example, when the seam portion shown in FIG. 3 is made into a desired seam portion, appropriate temporary fitting is performed on the seam portion shown in FIG. 3, and the first step is as shown in FIGS.
Using the seaming roll shown in Fig. 8 or Fig. 12 to Fig. 16, the tips of both flanges 1 and 2 are
After forming the seam shown in FIG. 8, the seam shown in FIG. 3 is continuously wound and tightened using the seam rolls shown in FIGS. 3 and 11 as a second step to form the desired seam shown in FIG. can be molded.

Similarly, when making the seam part shown in Figs. 4 to 8 into a desired seam part, the seam part shown in Figs. A seam portion with a small number of layers can be formed at the tips of both flanges, and then, in a second step, a desired seam portion can be formed using a seam roll corresponding to the desired seam portion.

Furthermore, in the manufacturing method of the present invention, when the seam portions illustrated in FIGS. 3 to 8 are to be made into desired seam portions, the desired seam portions are formed in the first step by tightening rolls shown in FIGS. 12 to 16. The seam part with less winding layer is formed on the tips of both flanges, and then in the second step, the seam part with less winding layer is wound and the seam part with larger winding layer is formed by the seaming roll corresponding to the seam part with larger winding layer. A variety of desired seams can be formed in this way.

As explained above, the manufacturing method of the present invention is to form a center part of a desired seam part or a seam part smaller than the desired seam part at the tips of both flanges at the beginning of seaming, and then to This is a method of wrapping and tightening both the flanges that follow outwardly around the small seam part to form the desired seam part, and also forming the desired seam part by wrapping the two following concentric arc groups in the desired windings, winding layers, and the two types of concentric arc groups. Setting the temporary fitting conditions appropriately to obtain the desired inclination angle with respect to the container axis, which is a straight line passing through the center of the two, and tightening.
In this method, the desired seam portion is formed by tightening the winding until the desired winding, winding layer, and inclination angle are reached.

In the manufacturing method of the present invention, the windings, winding layers, and inclination angles can all be set to any desired values, and are not restricted to these values.

18 and 20 for manufacturing the seam portions illustrated in FIGS. 9 and 10 and the corresponding seam portions similar to the seam portions illustrated in FIGS. 4 to 8. The seam portion of the present invention is formed using a tightening roll similar to the roll explained in FIGS. 11 to 17, with the radius of curvature of the arc at the tip of the top and bottom plate flange shown in the figure being the minimum radius of curvature of the top and bottom plate flange at the seam portion. It can be manufactured by applying a method for manufacturing metal containers. The manufacturing method of the present invention is not limited to the size of the radius of curvature of the top and bottom plate flanges at the time of temporary fitting.

Furthermore, in the temporarily fitted state shown in FIGS. 18 and 20, the tip of the body plate flange 2 is formed in a straight line, but the tip is bent at an angle of 0° to 90° when the body plate flange 2 is formed. The seam can be formed into a circular arc having a central angle of , and the central part of the seam shown in FIGS. 19 and 20 can be easily formed.

In the manufacturing method of the present invention, the sealing compound can be filled during seaming, but if necessary, the tip of the top and bottom plate flanges and the tip of the body plate flange may be formed before seaming. The manufacturing method of the present invention can be applied by filling the portion with a sealing compound and subjecting it to treatments such as drying and temporarily fitting it.

As explained above, the seam portion of the present invention is completely different from conventionally known seam portions, and cannot be manufactured by conventionally known manufacturing methods. For example, as in U.S. Patent Re.29307 or Japanese Patent No. 989815, the tips of both flanges are engaged at the end of the seaming process, just before the end of the seaming process, or a seaming roll with a semicircular groove is used. It is clear that it is not possible to manufacture the seam portion having the point-symmetric shape of the concentric arcs of the present invention by a method that deforms the tip of the top and bottom plate flanges.

Further, the method for manufacturing a metal container having a seam portion of the present invention is disclosed in, for example, the above-mentioned US Patent Re29307 or Japanese Patent
In contrast to the manufacturing method of No. 989815, in which the outside of the seam is formed using a conventionally known simple seaming roll and the center of the seam is formed at the end of seaming, just before the seaming is completed, the seam is continuous in the cross section. The distance between the centers of two consecutive arcs that are made up of multiple arcs is 1/2 of the sum of the thicknesses of the multiple metal plates that make up the seam.
Using a seaming roll and a chuck ring having forming grooves of 180°, continuous two In this method, a group of concentric circular arc parts are formed, and most of the seam part is formed in the above-mentioned point-symmetric shape, and the center part of the seam part is formed at the beginning of seaming, and the center part of the seam part is The following flanges are alternately wrapped around the flange and tightly tightened, and when the tightening is completed, the desired external shape and outside of the seam part are formed.This method is completely different from conventional manufacturing methods, and the center part of the seam part is tightly tightened. It is possible to produce a metal container having an extremely high quality seam that can be formed reliably and accurately, and therefore has a uniformly accurate seam as a whole.

[Brief explanation of the drawing]

FIGS. 1A, 1B, and 1C are explanatory diagrams showing the seaming process of a conventionally known method for manufacturing a five-layer seam portion, showing the states at the time of temporary fitting, the final stage of seaming, and the completion of seaming, respectively. FIGS. 2A, 2B, and 2C are explanatory diagrams showing the seaming process of a conventionally known seven-layer seam manufacturing method, showing the states at the time of temporary fitting, at the end of seaming, and at the completion of seaming, respectively. 3 to 10 are explanatory diagrams showing examples of seam portions of the present invention, FIGS. 11 to 17 are explanatory diagrams illustrating seaming rolls used in the manufacturing method of the present invention,
FIG. 8 is an explanatory diagram showing the temporarily fitted state in the manufacturing method of the present invention, FIG. 19 is an explanatory diagram showing the state at the completion of the first stage of seaming in the manufacturing method of the present invention, and FIG.
FIG. 21 is an explanatory diagram showing another example of the temporary fitting state in the manufacturing method of the present invention, FIG. 21 is an explanatory diagram showing the state at the completion of the first stage of seaming in the manufacturing method of the present invention, and FIG. It is an explanatory view showing the state at the time of completion of the second stage of seaming in the manufacturing method. 1...Top plate flange, 2...Body plate flange,
1'...The part of the top and bottom plate flange parallel to the container axis,
2'...portion of the shell plate flange parallel to the container axis,
3... The center of the concentric arc group formed by both flanges and the center on the tip side of the top and bottom plate flange, 4... The center of the concentric arc group formed by both flanges and the center of the tip side of the body plate flange, 5... Seam Sealing compound filling part in the center of the part, 6... A straight line passing through the two common centers of the concentric arc group, 7... A straight line perpendicular to the container axis and passing through 3, 8... A straight line perpendicular to the container axis and passing through 4. 9...The outermost layer of the largest sector-shaped part on the container side of the seam portion sandwiched by 6 and 7 or 6 and 8, 10...
...The outermost layer on the upper left of the seam sandwiched by 6 and 8 or 6 and 7, 11...The smallest part of the seam, 12...
A straight line passing through 3 and parallel to the container axis, 13...A straight line passing through 4 and parallel to the container axis, 12'...A straight line indicating the lower end on the exit side of the seaming roll, 13'...A straight line on the entrance side of the seaming roll A straight line indicating the lower end, 14... seaming roll,
15, 15'... center of the arc of the chuck ring groove, 16... the chuck ring groove, 17... the upper straight line of the chuck ring, 18... the bottom of the chuck ring groove, R... the forming groove of the seaming roll.

Claims (1)

[Scope of Claims] 1. In a metal container having a seam portion in which the top and bottom plate flanges and the body plate flange are closely and alternately wound and tightened at at least one end of the container body, the top and bottom plate flanges and the body plate are separated in a cross section of the seam portion. The flanges are made up of a plurality of closely spaced circular arc parts, forming two groups of concentric circular arcs whose centers of curvature are shifted from each other.
One end of one arc section smoothly connects to one end of the other arc section on a common line passing through the centers of curvature of both concentric arc groups, and the distance between the centers of curvature of both concentric arc groups is determined by the thickness of the top plate flange and the body plate. A metal container characterized by having a thickness that is 1/2 of the sum of the plate thickness of the flange. 2. The metal container according to claim 1, in which each group of concentric arcs comprises an arc portion having a central angle of 180°. 3. The metal container according to claim 1, wherein each concentric arc group comprises an arc portion with a central angle of 180° and a circular arc portion with a central angle of less than 180°. 4 Claim 1 having a point-symmetric circular arc portion with the center of symmetry being the midpoint of the centers of curvature of both concentric circular arc groups
3. The metal container according to item 2, item 3, or item 3. 5. The metal container according to any one of claims 1 to 4, wherein the common line passing through the centers of curvature of both concentric arc groups is inclined with respect to the axis of the metal container. 6. The metal container according to any one of claims 1 to 5, wherein a common line passing through the centers of curvature of both concentric arc groups is parallel or perpendicular to the axis of the metal container. 7. Claims 1 to 6, wherein the center of curvature of one group of concentric arcs is located at the center of the thickness of the top and bottom plate flange, and the center of curvature of the other group of concentric arcs is located at the center of the thickness of the body plate flange. A metal container described in any of paragraphs. 8. The metal container according to any one of claims 1 to 7, wherein the minimum radius of curvature of each concentric arc group is (0.5 to 1.0) times the thickness of the top and bottom plate flange or the body plate flange. 9. The top and bottom plate flanges and the body plate flanges are alternately formed by a seaming roll having a forming groove with a cross-sectional shape having at least one circular arc portion and a chuck ring having a forming groove with a cross-sectional shape having at least one circular arc portion. In the method for manufacturing a metal container, the radius of curvature of at least one arcuate portion of the forming groove of the chuck ring is tightly rolled up to form a seam at at least one end of the container body, is the sum of the radius of curvature of the arc portion of the forming groove and 1/2 of the sum of the thickness of the top and bottom plate flange and the thickness of the body plate flange, and the center of curvature of the arc portion of the forming groove of the seaming roll. The center of curvature of the arc portion of the forming groove of the chuck ring is on a common line passing through both centers of curvature at the time of completion of seaming, and the distance between the centers of curvature is equal to the thickness of the top and bottom plate flange and the plate thickness of the body plate flange. The seaming roll and the chuck ring are arranged so that the seaming roll is 1/2 of the sum of forming a group of concentric arcs,
It has a seam portion characterized by wrapping and tightening the top and bottom plate flanges and the body plate flange so that one end of one circular arc portion smoothly connects to one end of the other circular arc portion on a common line passing through the centers of curvature of both concentric circular arc groups. Method for manufacturing metal containers. 10 The forming groove of the seaming roll has a semi-circular cross-sectional shape, the forming groove of the chuck ring has a cross-sectional shape of a quarter arc, and the seaming roll is pushed down toward the chuck ring to form the seaming roll. A patent claim that forms a seam portion having a plurality of semicircular arc portions centered on the center of curvature of the groove, a plurality of quarter arc portions centered on the center of curvature of the forming groove of the chuck ring, and at least one semicircular arc portion. A method for manufacturing a metal container having a seam portion according to Item 9. 11 The forming groove of the seaming roll has a cross section consisting of a first circular arc portion and a second circular arc portion having a radius of curvature smaller than the radius of curvature of the first circular arc portion and following the first circular arc portion,
The cross section of at least one circular arc portion of the forming groove of the chuck ring is an arc equal to the radius of curvature of the first circular arc portion of the seaming roll, and the seaming roll is pushed down toward the chuck ring, and the forming groove of the seaming roll is pressed down. A plurality of circular arc parts including at least one semicircular arc part whose center is equal to the curvature radius of the first circular arc part and whose center is the center of curvature of the forming groove of the chuck ring, and the center of curvature of the second circular arc part of the forming groove of the seaming roll. 10. The method of manufacturing a metal container having a seam portion according to claim 9, wherein the seam portion has a plurality of circular arc portions including at least one semicircular arc portion at the center. 12 The forming groove of the chuck ring has a first circular arc portion close to the seaming roll and equal to the curvature radius of the first circular arc portion of the seaming roll, and a curvature of the second circular arc portion of the seaming roll far from the seaming roll. 12. The method of manufacturing a metal container having a seam portion according to claim 11, which has a second circular arc portion centered at the center and having a radius of curvature larger than the first circular arc portion of the chuck ring. 13 In cross section, the shell plate flange before seaming consists of a straight part and a curved part having at least one radius of curvature and a center of curvature, and the top and bottom plate flange before seaming consists of a straight part and a curved part having at least one radius of curvature and a center of curvature. They both have the same radius of curvature and the same center of curvature, and are composed of a curved part on the top and bottom plates, and the dimensions of the top and bottom plate flanges and the body plate flange are those of the top and bottom plate flanges when the top and bottom plates are fitted to the body plate. The distance along the inner surface of the top and bottom plate flange between the outer tip of the straight part and the outer tip of the straight part of the body plate flange is equal to the distance between the tip of the top and bottom plate flange and the body plate when winding is completed at a predetermined winding angle. The body plate is wound until the end of the predetermined winding angle, which is set in advance so that the relative position of both tips to the tip of the flange is equal to the relative position of both tips at the center of the completed seamed part. The dimension is equal to the distance that the tip of the flange moves relative to the top and bottom plate flange along the inner surface of the top and bottom plate flange, and the tip of the top and bottom plate flange moves within the preset distance before the pressing down on the chuck ring of the seaming roll. A claim that presses down the seaming roll so as to wind it in the forming groove of the seaming roll by the winding angle, and then tightens both flanges to the final seam shape without changing the relative positions of both flanges. A method for manufacturing a metal container having a seam portion according to any one of items 9 to 12. 14 In a method for manufacturing a metal container in which the top and bottom plate flanges and the body plate flanges are alternately tightened in close contact to form a seam at at least one end of the container body, the outer shape of the desired seam is determined at the initial stage of seaming. A desired center part of the seam is formed at the tips of the top plate flange and the body plate flange using a seaming roll having a forming groove with a radius of curvature smaller than the curvature radius, and then a seam having a radius of curvature larger than that of the seaming roll is formed. The method is characterized in that both of the following flanges are wrapped around the outside of the center part using a seaming roll having forming grooves, and the outside of the seam part is sequentially formed to form a desired seam part. A method for manufacturing a metal container having a seam.