METHOD OF MAKING AEROSOL VALVE MOUNTING CUPS AND RESULTANT CUPS
Metal discs, preferably circular, are cut to a precise diameter and drawn to a preform with a channel and skirt for an aerosol valve mounting cup. The preform then undergoes further forming operations at the stations in a press system. “Bumping” is carried out on the skirt edge at a station, to eliminate non-burr trimming of the cup edge, save material and obtain a carefully controlled skirt height and a substantially even skirt edge with minimized earring. The resultant cup terminating skirt edge is characterized by reformed metal. A further coaxing or pinch-cut operation may be performed on the cup skirt.
1 . A method of manufacturing a mounting cup for an aerosol valve, said cup having an inner pedestal portion for mounting the aerosol valve, an outer circular channel portion for mounting on the bead of an aerosol container, and a skirt portion forming the outer wall of the channel portion with said skirt portion having a specified skirt height and a terminating edge, said method comprising:
cutting a metal blank from a metal sheet, said blank having a curved perimeter;
pressing and drawing said blank into a mounting cup preform in a preform pressing and drawing station, said preform having a channel portion and a skirt portion having a skirt height and a terminating edge;
performing further forming operations on the mounting cup preform at a plurality of further stations to further form the mounting cup shape; and
performing a bumping operation on the skirt portion terminating edge at one of said stations, said bumping operation comprising striking said skirt terminating edge to reduce the skirt height to its specified dimension.
2 . The method of claim 1 , wherein said cut metal blank is a circular disc.
3 . The method of claim 2 , wherein the perimeter of the mounting cup during its formation from the metal disc lacks any cutting operation to trim excess non-burr material from the perimeter.
4 . The method of claim 2 , further comprising a circular centering ring that extends into the circular channel portion of the cup during the bumping operation, said centering ring having a notch in its outside diameter with an upper notch wall, and further comprising bumping the skirt portion terminating edge with the upper notch wall just before bottoming the centering ring in the channel portion of the cup.
5 . The method of claim 2 , further comprising a circular centering ring that extends into the circular channel portion of the cup during the bumping operation and has an adjacent bumping ring, and further comprising bumping the skirt portion terminating edge with the bumping ring just before bottoming the centering ring in the channel portion of the cup.
6 . The method of claim 2 , further comprising a circular centering ring that extends into the circular channel portion of the cup during the bumping operation, and further comprising clamping the channel portion between the centering ring and a lower support ring, and thereafter bumping the skirt portion terminating edge with a separate bumping ring.
7 . The method of claim 1 , wherein said bumping operation comprising striking said skirt terminating edge is also to minimize any unevenness of the skirt terminating edge, said further stations include a reverse station, and comprising carrying out said bumping operation at said reverse station.
8 . A metal mounting cup for an aerosol valve, said cup having an inner pedestal portion for mounting the aerosol valve, an outer circular channel portion for mounting on the bead of an aerosol container, and a skirt portion forming the outer wall of the channel portion, said skirt portion having a specified skirt height and a terminating edge, said terminating edge being a bumped edge characterized by reformed metal at the terminating edge.
9 . The mounting cup of claim 8 , wherein said terminating edge has minimized unevenness resulting from a bumping operation.
10 . The mounting cup of claim 8 or 9 , wherein said terminating edge has a shiny area resulting from a bumping operation.
11 . The mounting cup of claim 8 or 9 , wherein the terminating edge has a slightly thicker cross-section resulting from a bumping operation.
12 . A method of manufacturing a mounting cup for an aerosol valve, said cup having an inner pedestal portion for mounting the aerosol valve, an outer circular channel portion for mounting on the bead of an aerosol container, and a skirt portion forming the outer wall of the channel portion with said skirt portion having a specified skirt height and a terminating edge, said method comprising:
cutting a metal blank from a metal sheet, said blank having a curved perimeter;
pressing and drawing said blank into a mounting cup preform in a preform pressing and drawing station, said preform having a channel portion and a skirt portion having a skirt height and a terminating edge;
performing further forming operations on the mounting cup preform at a plurality of further stations to further form the mounting cup shape; and
performing a bumping operation on the skirt portion terminating edge at one of said stations, said bumping operation comprising striking said skirt terminating edge to reduce the skirt height to its specified dimension and to eliminate any unevenness of the skirt terminating edge.
13 . A method of manufacturing a metal mounting cup for an aerosol valve, said cup having an inner pedestal portion for mounting the aerosol valve, an outer circular channel portion for mounting on the bead of an aerosol container, and a skirt portion forming the outer wall of the channel portion with said skirt portion having a skirt height and a terminating edge, said method comprising:
specifying a skirt height for said skirt portion of said manufactured mounting cup;
providing a mounting cup preform having said outer channel portion, said skirt portion and said terminating edge; and
performing a bumping operation on said skirt portion terminating edge, said bumping operation comprising striking said skirt terminating edge to reduce the skirt height to its said specified dimension.
14 . The method of claim 13 , wherein said bumping operation comprising striking said skirt terminating edge is also to minimize any unevenness of the skirt terminating edge.
15 . A method of manufacturing a metal mounting cup for an aerosol valve, said cup having an inner pedestal portion for mounting the aerosol valve, an outer circular channel portion for mounting on the bead of an aerosol container, and a skirt portion forming the outer wall of the channel portion with said skirt portion having a skirt height and a terminating edge, said method comprising:
specifying a skirt height for said skirt portion of said manufactured mounting cup;
providing a mounting cup preform having said outer channel portion, said skirt portion and said terminating edge; and
performing a bumping operation on said skirt portion terminating edge, said bumping operation comprising striking said skirt terminating edge to reduce the skirt height to its specified dimension and to even out or substantially even out the skirt edge to the specified dimension to minimize earring.
16 . The method of claim 1 , 2 or 12 , said further stations include a reverse station, and comprising carrying out said bumping operation at said reverse station.
17 . The method of claim 13 , 14 or 15 , wherein said bumping operation comprising striking said skirt terminating edge of said preform is carried out at a reverse station.