Patent ID: 6789406
Filing Date: 2004-09-14
Classification: B21D,B23P,F02M,Y10T

Abstract:
A method of forming orifices in a metal sheet, each orifice having an oblique axis relative to at least one of a first surface and a second surface of a metal sheet, the method comprising:punching the metal sheet in a first direction along a first axis perpendicular to one of the first and second surfaces of the metal sheet with a first tool piece so as to form a first orifice, the first orifice defining an opening having wall surfaces parallel to the first axis; and punching the metal sheet with the first tool piece proximate the first orifice in the first direction along a second axis parallel and offset to the first axis so as to form a first wall surface of the first orifice extending between the first and second surfaces of the metal sheet oblique to the first axis.