Method for improved valve seating of a fuel injector by coining and a valve made thereby

A method for making a valve assembly comprising:

• receiving an elongate first workpiece through a first end of the passage of a body extending along a longitudinal axis and second and third workpieces through the second end of the passage, the second work piece having a surface;
• disposing the first, second and third work pieces axially between a pair of aligned elements that are adapted to be relatively movable toward and away from each other with respect to the body and along the longitudinal axis, the third work piece being disposed directly against the second work piece;
• increasing a clamping force being applied to the pair of aligned elements toward each other so that the clamping force acts to coin a zone of surface contact between the first end and the surface, the clamping of the pair of aligned elements including bearing one of the pair of aligned elements directly against the third work piece;
• vibrating the pair of aligned elements during the increasing of the clamping force while the first workpiece remains stationary in a radial direction with respect to the longitudinal axis;
• and
• releasing the clamping force after a period of time.