forming tool of the periphery of at least one orifice in a room and Tolee METHOD OF FORMING at least one orifice in a room Tolee by the use of such a tool

A periphery of the forming tool (22) of at least one orifice formed in one piece (20) paneled extending in a plane, said main plane, characterized in that it comprises: a matrix ( 10) having at least one housing (11) deforming said rim (22) comprising an opening (12), a bottom (13) and walls (14) extending concave side of the opening (12) to the bottom (13); at least one punch (30) comprising a face (31) contact designed to bear against the periphery (22) of an orifice of said piece (20) paneled and a face (32) of hit to be struck by a tool, said face (31) of contact being formed to said housing (11) from deformation; against a plate (40) comprising at least a guide channel of a punch (30) against said plate (40) being intended to come to bear against said part (20) and guiding this tolee punch (30) during a strike on the punch so that the punch (30) causes a deformation of said periphery (22) of an orifice by compression of said piece (20) paneled against the walls of said housing (11) deforming and moving said competes orifice in a plane parallel to said main plane.