Patent ID: 6678955
Filing Date: 2004-01-20
Classification: F02M,Y10T

Abstract:
An apparatus for working an injection hole of a fluid injection nozzle, the apparatus comprising:a fluid injection nozzle having a valve body forming a fluid path inside thereof and having a valve seat and an orifice plate arranged at a front end face of the valve body, the orifice plate having at least one injection hole in a desired size with a divergent diameter from a fluid inlet to a fluid outlet, and a valve member for closing the fluid path by being seated on the valve seat and opening the fluid path by separating from the valve seat; wherein a central axis line of the injection hole connecting a center of the fluid inlet of the injection hole to a center of the fluid outlet of the injection hole is inclined to a line perpendicular to a face of the orifice plate; and wherein a first intersection and a second intersection of imaginary lines drawn from a first face and a second face of the injection hole, respectively, are inclined to the central axis line of the injection hole and are also inclined to the line perpendicular to the face of the orifice plate; a die mounted with a plate-like material before working the injection hole of the fluid injection nozzle; a punch substantially in a shape of a truncated circular cone, a shape of a front end portion of the punch is provided with a first inclination angle and a second inclination angle relative to the line perpendicular to the face of the plate-like material; a punch guide having a support hole for slidably supporting the punch such that a central axis line of the punch is inclined to the line perpendicular to the face of the plate-like material; and a punch driving means for advancing the punch along the central axis line of the punch guide; wherein the punch guide uses a die structure capable of receiving a side force (Fs) from the front end portion of the punch produced in working the injection hole when the central axis line of the injection hole is inclined to the line perpendicular to the face of the plate-like material.