This standard is applicable to the shot-blasting technical specification of coiled helical compression spring formed by cold rolling with steel of φ1.0 to φ8.0mm in diameter.
2 Terms
For the purposes of this standard, the following definitions apply.
2.1 shot-blasting peening
a craft measure by jetting high-speed moving shot flow to spring to generate compression stress on its surface so as to enhance the fatigue strength, increase the service life and improve the stress corrosion resistance
2.2 arc height
the surface layer of test piece is plastically deformed under the impact of shot-blasting, so that the shot-blasting surface of the test piece is spherically curved, and the distance between the specific reference plane cut into the spherical surface and the highest point of the spherical surface is determined as the arc height
2.3 shot-blasting strength Q
the arc height at the saturation point of arc height curve is defined as shot-blasting strength
2.4 surface coverage rate
ratio of the area occupied by the crater on the shot-blasted surface to its total area is called the surface coverage rate.
