Method for producing rolled edge

Abstract

The invention relates to a method for the production of a rolled edge from an edge section (11) of a tube, wherein a flanging die is driven onto the edge section and flanges it into a roll. According to the invention, an initial area (14) of the edge section (11) is previously rolled in a positive fit manner by means of a forcibly controlled tool (30). This prevents buckling of the initial area (14), which has a controlled geometry as a result of rolling. The novel method is preferably used in the production of valve seats in so-called aerosol domes for spray cans.

Description

technical field The present invention relates to a method of producing a crimp from an edge portion of a tube, wherein a crimping die is moved into the edge portion and rolls it into a roll. In a different application, this type of method occurs during the manufacture of so-called aerosol hoods for aerosol cans, in which a tubular portion of the hood just forms such a bead for mounting the valve disc. In this case, particularly high demands are made on precision and thin sheets only a few tenths of a millimeter thick have to be machined. Background technique In the modern manufacture of crimping on aerosol hoods, a crimping die with a defined radius is moved by drawing technology into the aerosol hood of a previously produced tube part and the edge of the tube part is rolled into a coil . The shape and dimensions of the crimp are now largely determined by the geometry of the crimp die and its stated radius. However, the starting area of ​​the beading in this forming pro...

AI Technical Summary

Problems solved by technology

It can be seen that when passing from FIG. 2 a) to FIG. 2 b), the aforementioned inflection point 13 is formed in the initial region 14 forming a practically straight line, which is disadvantageous during the further shaping process according to FIGS. 2 c)-2 e). kept

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