Smoothing method

Abstract

A smoothing method includes: a step of attaching a workpiece to a rotating shaft of a rotating mechanism; and a step of performing direct pressure blasting on the workpiece while rotating the workpiece about the rotating shaft as an axial center. In the blasting, injection media are injected in a direction orthogonal to the rotating shaft, the injection media include a core material made of an elastic body and abrasive grains provided on a surface of the core material, and hardness of the core material is lower than hardness of the abrasive grains.

What is claimed is: 
     
         1 . A smoothing method comprising:
 a step of attaching a workpiece to a rotating shaft of a rotating mechanism; and   a step of performing direct pressure blasting on the workpiece while rotating the workpiece about the rotating shaft as an axial center,   wherein in the blasting, injection media are injected in a direction orthogonal to the rotating shaft,   wherein the injection media include a core material made of an elastic body and abrasive grains provided on a surface of the core material, and   wherein hardness of the core material is lower than hardness of the abrasive grains.   
     
     
         2 . The smoothing method according to  claim 1 , wherein in the step of performing the blasting, an injection pressure of the injection media is set to 0.01 MPa or more and 0.10 MPa or less. 
     
     
         3 . The smoothing method according to  claim 1 , wherein in the step of performing the blasting, an injection distance of the injection media is set to 50 mm or more and 100 mm or less. 
     
     
         4 . The smoothing method according to  claim 1 , wherein in the step of performing the blasting, a rotational frequency of the workpiece is set to 30 revolutions per minute or less. 
     
     
         5 . The smoothing method according to  claim 1 , wherein a content rate of the abrasive grains in the injection media is 15% by mass or more and 26% by mass or less. 
     
     
         6 . The smoothing method according to  claim 1 , wherein the injection media have a particle size distribution of 125 μm or more and 600 μm or less. 
     
     
         7 . The smoothing method according to  claim 1 , wherein in the step of performing the blasting, a first period during which the workpiece is rotated in a first rotation direction about the rotating shaft as an axial center and a second period during which the workpiece is rotated in a second rotation direction opposite to the first rotation direction are alternately repeated. 
     
     
         8 . The smoothing method according to  claim 1 , further comprising a step of performing peening on the workpiece before the step of performing the blasting.