Patent ID: 11883929
Assignee: SUGINO MACHINE LIMITED
Field: Machine tools (Mechanical engineering)
Classification: CPC B  C  Y | IPC B

Claim 15:
16. An abrasive peening method, comprising:
putting abrasive particles into a processing tank;
ejecting peening liquid from an internal outlet disposed inside each of stirring nozzles, the stirring nozzles evenly arranged in a lower portion of the processing tank, the stirring nozzles each including
a body extending upward,
a peening liquid inlet located at a lower end of the body,
an internal outlet located inside the body, the internal outlet being in fluid communication with the peening liquid inlet,
a stirring-nozzle outlet located at an upper end of the body,
a passage connecting the internal outlet and the stirring-nozzle outlet, the passage extending vertically inside the body, and
a radially oriented suction port located on an outer surface of the body and within the recess in which the stirring nozzle is disposed, the suction port being in fluid communication with a lower end of the passage so as to entrain abrasive particles from within the recess in which the given stirring nozzle is disposed into peening fluid flowing through the passage from the internal outlet to the stirring-nozzle outlet,

sucking suspension of the peening liquid and the abrasive particles floating inside the recess around the stirring nozzle into the stirring nozzle;
blowing up the sucked suspension from the stirring-nozzle outlet toward inside the processing tank to float the abrasive particles;
ejecting the peening liquid from a peening nozzle immersed in the peening liquid that is stored in the processing tank toward a surface of a workpiece disposed in a bottom portion of the processing tank;
peening the surface of the workpiece with the abrasive particles on a flow of ejected peening liquid colliding with the workpiece; and
applying residual stress to the surface of the workpiece with cavity generated by the ejected peening liquid colliding with the workpiece.