Process for manufacturing a captive screw

Details Process for manufacturing a captive screw Process for manufacturing a captive screw

B - Operations, Transporting

23

G

B23G 5/00 (2006.01) B21D 22/00 (2006.01) B21D 22/20 (2006.01) B21D 28/00 (2006.01) B21D 53/00 (2006.01) B21G 5/00 (2006.01) B21H 3/02 (2006.01) B21K 1/00 (2006.01) B21K 21/02 (2006.01) B23P 19/08 (2006.01) F16B 41/00 (2006.01) F16B 5/02 (2006.01)

Patent

CA 2328161

A method of making a knob (30) and ferrule (50) for a captive screw (10) is disclosed, the knob (30) integrally attached to the screw (10), the ferrule (50) attachable to a panel (60). The method of making the knob (30) includes providing an aluminum alloy base metal for the knob (30), pressing by cold- forming the base material into a generally cylindrical cup-shaped article (32) using at least one pressing operation, the cup having a generally cylindrical side wall (33), removing any base material situated outside of the perimeter of the cup-shaped article (32) and providing a hole in the bottom of the cup (32), coaxial with the hollow cylindrical walls (33) of the cup (32), thereby forming the knob (30).

L'invention concerne un procédé de fabrication d'un bouton (30) et d'une ferrule (50) pour une vis prisonnière (10). Ledit bouton (30) est fixé d'une pièce à la vis (10), la ferrule (50) se fixe à un panneau (60). Le procédé de fabrication dudit bouton (30) consiste à prévoir un métal de base en alliage d'aluminium pour le bouton (30) ; à emboutir par formage à froid le matériau de base de sorte qu'un article cupuliforme (32) généralement cylindrique soit formé, par au moins une opération d'emboutissage, la coupelle possédant une paroi latérale (33) généralement cylindrique ; à enlever tout matériau de base situé à l'extérieur du périmètre de l'article cupuliforme (32); à former un orifice dans le fond de la coupelle (32), coaxialement par rapport aux parois cylindriques (33) de cette dernière (32), et à former ainsi le bouton (30).

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