Patent ID: 7162907
Filing Date: 2007-01-16
Classification: B21D,Y10T

Abstract:
1. A tool for punching a metering orifice extending at an acute angle through a fuel metering disc of a fuel injector along an orifice axis with respect to at least one planar surface of the metering disc, the metering orifice extending between first and second generally planar surfaces spaced along a longitudinal axis of the disc, the tool comprising: an elongated body extending along a tool axis between a first tool end and second tool end about a tool axis to define a tool perimeter, the first tool end configured to receive a tool punching force, the second end including: a pilot portion having a first surface disposed on a first plane generally transverse to the tool axis, the first surface including a first surface area offset to the tool axis, the first surface area of the pilot portion including an area bounded by a first arcuate portion of the perimeter of the second tool end and a first chord connecting the first arcuate portion; a main portion having a second surface area greater than the first surface area offset to the tool axis, the second surface area disposed on a second plane wherein the second surface area of the main portion comprises an area bounded by a second arcuate portion of the perimeter of the second tool end and a second chord connecting the second arcuate portion; and a transition portion disposed on a third plane generally oblique to the tool axis, the transition portion intersecting the longitudinal axis and connecting the pilot portion and the main portion.