US 6,554,556 B2Granted

Method for the manufacture of a ring part out of sheet metal for a lid of a can

AssigneeRasselstein Hoesch GmbH

InventorsWerner Erfgen, Reiner Sauer

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Abstract

For the manufacture of a ring part out of a flat sheet-metal part to form a lid for a lid of a can. A hot-sealable coating is provided on one side of the sheet-metal part which is then shaped into a cylindrical tube with the coating being on the inside. The axially extending edges of the tube are joined together to form a butt-joint and the inside surface thereof pressed against a cooling plate. A butt-joint welding seam is then created by means of a laser jet. The tube is separated into equal length tube sections and each is conically enlarged at one end. The other end of each tube section is bent radially inwardly to form a bearing surface for a tear-off foil. By flanging the conically enlarged end, an annular flange is created to receive a body of a can.

Claims5

Dependent claims

A method for the manufacture of a ring part out of sheet metal for a lid of a can comprising the following steps:

a) shaping of a flat sheet-metal part, which has a hot-sealable coating on one side, into a cylindrical tube, where the coating is on the inside facing surface,
b) pressing the axially extending edges of the tube together to form a butt-joint and pressing a cooling plate against the inside of the tube along the axially extending edges,
c) providing a butt-joint welding seam along the axially extending edges by means of a laser jet directed onto the outside of the edges,
d) separating the tube into equal length tube sections,
e) providing a conical enlargement at one end of each tube section,
f) radial pulling in of the other end of each tube section to form a bearing surface for a tear-off foil, and
g) flanging of the conically enlarged end to form an outer annular flange configured to receive a body of a can.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/846,167Filed 1 May 2001
Priority: DE 100 22 55310 May 2000
Published: US 2001/0041115 A115 Nov 2001
Granted: 29 Apr 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B21D 51/44
Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures: making closures, e.g. caps
B21D 53/16
Making other particular articles: rings, e.g. barrel hoops
B65D 17/502
Flexible tape or foil-like material: applied to the external part of the container wall only
Y10S 72/702
Metal deforming: overbending to compensate for springback