Method for manufacturing projection materials for a shot peening

Abstract

Provided is a method for manufacturing a blasting material for shot peening with which a reliably high level of hardness can be achieved while preventing an increase in the material cost. Quenchable steel is used as a material in a blasting material manufacturing step (S 10 ). After granules ( 4 ) which are quenched by means of a water atomization method are formed in a quenching step (S 20 ), the granules ( 4 ) are tempered inside a heating furnace ( 5 ) at a prescribed temperature (from 130-230° C., and preferably from 160-230° C.) For a prescribed amount of time in a tempering step (S 30 ). A work hardening treatment is applied in a work hardening step (S 40 ) wherein the granules ( 4 ) are blasted/bombarded onto a target material ( 7 ) to apply stress to the granules ( 4 ) using an apparatus for shot peening ( 6 ).

1 . A method for manufacturing projection materials for a shot peening, the method comprising the steps of
 quenching the projection materials by rapidly cooling them;   tempering the projection materials at a predetermined temperature for the tempering;   work hardening the projection materials by imparting a stress on them;   wherein the steel is used as raw materials for the projection materials.   
     
     
         2 . The method recited in  claim 1 , wherein the predetermined temperature of the tempering is to be set within a range of from 130° C. or more to 280° C. or less. 
     
     
         3 . The method recited in  claim 1 , wherein the predetermined temperature of the tempering is to be set within a range of from 160° C. or more to 230° C. or less.