Patent ID: 8256117

Claim:
A method for controlled shot-peening of blisk blades, comprising: providing at least two shot-peening streams of driven shot-peening medium; using the at least two shot-peening streams to separately shot-peen each blisk blade along side-by-side processing paths, simultaneously on a pressure and on a suction side, on immediately opposite locations on surfaces of the pressure side and the suction side; the at least two shot streams essentially vertically striking the pressure side and suction side blade surfaces and having essentially identical shot-peening intensity; shot-peening each blisk blade separately as an integral part of a blisk rotor; producing the shot streams with compressed air exiting from a shot-peening unit having dual opposed nozzles; providing each nozzle with an elongated portion through which one of the two shot-peening streams is guided essentially parallel to a longitudinal axis of each blisk blade from a free tip of each blisk blade and between each blisk blade and an immediately adjacent blisk blade; further providing each nozzle with an impingement plate inclined to direct the shot stream to essentially vertically strike the one of the pressure and suction side surface and positioned at a distal end of the elongated portion for redirecting the one of the two shot-peening streams from essentially parallel to the longitudinal axis of each blisk blade to essentially vertical to one of the pressure and suction side surfaces; providing that the elongated portion of the nozzle extends a length sufficient to position the impingement plate at a base of each blisk blade between each blisk blade and the immediately adjacent blisk blade such that the impingement plate can be sequentially positioned directly adjacent to the one of the pressure and suction side surface providing that the elongated portion of the nozzle extends a length sufficient to sequentially guide the one of the two shot-peening streams essentially vertically along the one of the pressure and suction side surfaces; and moving and swiveling the shot-peening unit to follow along the suction side and pressure side surfaces to maintain the essentially vertical striking and essentially identical shot-peening intensity.