Shot Peening Apparatus

Author:  Blackburn, M. O.
Source:  US Patent 2,900,765
Doc ID:  1959003
Year of Publication:  1959
Abstract:  
This invention pertains to centrifugal blasting apparatus, and particularly to a centrifugal propelling machine for selective shot peening. The present invention relates to apparatus for automatically selectively shot peening an object to concentrate the work hardening in a particular area and graduate the work hardening over other portions of the object. Accordingly, among my objects are the provision of means whereby thrown particulate material will be distributed over a path of predetermined area with a concentration at a portion of the area of the path; the further provision of a throwing wheel having a plurality of radially arranged slots with peripheral discharge openings of different cross-sectional areas; the still further provision of throwing apparatus including means for regulating the rate of flow of particulate material there-through; and the still further provision of a centrifugal blasting machine having a throwing wheel with a plurality of peripheral discharge openings of graduated cross-sectional area so as to concentrate the particulate material thrown thereby against a particular area of the object.