Claims
- 1. In a method of manufacturing a seam connection, between and edge of a radially outwardly extending flange (9) at one end of a body (1) of a metal container which is a figure of revolution having an axis, and an edge flange (5) of a metal end closure wall (2), in which said edge flange (5) is provided with a precurl (6) with a small radius, the inner diameter of said precurl (6) being larger than the thickness of the end edge (11) of said extending flange (9), which extending flange (9) at the location of a transition (10) toward the body (1) has a curvature having a radius of a magnitude such that a gradual bend transition is obtained from the body (1) toward said extending flange (9) and said edge flange (5) of said end closure wall (2) merges into said end closure wall (2) by a curvature (4), which edge and extending flanges (5, 9) after placing and axially pressing said end closure wall (2) and said body (1) upon each other are rolled into each other with the aid of at least one seaming roller (14) having a groove (15), which roller (14) is displaced in circumferential direction with respect to said body (1) and radially toward the body (1) to perform the rolling into each other of said edge and extending flanges (5, 9) inside said groove (15) of said seaming roller (14) with simultaneous centering and supporting of said end closure wall (2) on the inner side of said edge flange (5) of said end closure wall (2), said groove (15) of said seaming roller (14) having a height (K), which is larger than a thickness (V) of said precurl (6) measured in a direction parallel to said axis;
- the improvement wherein an upstanding edge (3) of said end closure wall (2) and said transition (10) between said body (1) and said extending flange (9) are entirely spaced apart from each other, and wherein
- said precurl (6) at the beginning of the seaming operation is guided into that portion of said groove (15) of said seaming roller (14) which, seen in axial direction, is closer to the other end of said body (1), and wherein
- it is an underside (12) of said precurl (6) which first comes into contact with said portion of said groove (15).
- 2. Method according to claim 1, wherein during seaming, said end closure wall (2) is supported by a surface (13) extending around the axis of said body the largest diameter of which is smaller than the diameter of the body (1) to an extent such that a reduction of the diameter of the body takes place adjacent to the seam.
- 3. Method according to claim 1, wherein the edge flange (5) is precurled such that it is practically closed.
- 4. Method according to claim 3, wherein the outer diameter of the body flange (5) corresponds with the inner diameter of the precurl of the edge wall flange such that said edge wall flange and body flange can be centered upon each other.
- 5. Method according to claim 1, wherein a conical sleeve surface (24) is given to said upstanding edge and a support surface (29) for said conical sleeve surface (24) has a corresponding conical shape and only a part of the height of the sleeve surface engages said support surface (29).
- 6. Method according to claim 1, wherein said depth (D) of said upstanding edge of said end wall is defined by said height (H) of said upstanding edge to be achieved less a height (K) of said groove of said seaming roller and plus a thickness (V) of said precurl according to the formula
- D=H-K+V.
- 7. Method according to claim 1, wherein a conically shaped central bulge (39) is given to said end wall which fits into a corresponding hollow (38) of a support for said end closure wall and said upstanding edge of said end closure wall joins said end closure wall at a an acute angle with a radial plane of said end closure wall and wherein said extending flange is directed parallel thereto prior to starting seaming.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8802339 |
Sep 1988 |
NLX |
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Parent Case Info
This application is a continuation of application Ser. No. 440,763, filed Sep. 18, 1989, now abandoned.
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Continuations (1)
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Number |
Date |
Country |
Parent |
440763 |
Sep 1989 |
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