Internal Peening Apparatus

Author:  Metal Improvement Co./Burney
Source:  US Patent 3,485,073
Doc ID:  1969003
Year of Publication:  1969
Abstract:  
The disclosure relates to apparatus particularly suited and arranged for treating and peening the interior surface of a workpiece. A tubular lance device from which peening shot are ejected is extended along an axial path relative to the workpiece for both reciprocatory and rotary motion. The shot are ejected under fluid pressure from a nozzle located at one end of the lance so that the path of ejection is normal to the surface of the workpiece being treated.