Manufacturing process for electric lightbulb caps

摘要

Process for the manufacture of electric lightbulb caps, which comprises the following steps: forming a body of revolution (8) with a base (14), an internal surface (16), and an external surface (18) with a cylindrical segment (20), distanced from the base (14), and which is crowned by an annular protrusion (22), in which the forming step is constituted by an operation of the group formed by injection, extrusion, casting, sintering and machining; obtaining a permanent joined body (4) comprising the body of revolution (8) and a contact plate (6) having a flat annular base (10) and a tubular appendix (12); provision of a sheathing (2) with a lower aperture (24) delimited by a doubling (26) of the sheathing (2) directed towards the interior of the sheathing (2) and whose external surface (28) is cylindrical; and application of the sheathing (2) against the permanent joined body (4).