Jan 25, 2021
① Shot blasting size
The larger the shot blasting, the greater the impact kinetic energy and the greater the shot blasting strength, but the coverage rate of shot blasting decreases. Therefore, while ensuring the strength of shot blasting, smaller shot blasting should be used as much as possible. In addition, the size of shot peening is also limited by the shape of the part. When there is a groove on the part, the shot blasting diameter should be less than half of the radius of the inner circle of the groove. Shot blasting particle size is often selected between 6-50 mesh.
②The hardness of shot blasting
When the shot blasting hardness is higher than the part hardness, the change of its hardness value does not affect the shot blasting strength; When the shot blasting is softer than the part, if the shot blasting hardness value decreases, the shot blasting strength also decreases.
③ Shot blasting speed
When the shot blasting speed increases, the shot blasting strength also increases, but when the speed is too high, the shot blasting damage increases.
④Spray angle
When the shot blasting jet is perpendicular to the surface to be sprayed, the shot blasting strength is the highest, so it should generally be kept in this state for shot blasting. If limited by the shape of the part, when small angle shot peening is necessary, the size and speed of shot peening should be appropriately increased.
⑤The amount of broken shot blasting
The kinetic energy of shot blasting fragments is low. The more shot blasts that are broken, the lower the shot peening strength, and irregular fragments will scratch the surface of the part. Therefore, the fragments should be removed frequently to ensure that the shot blasting integrity rate is greater than 85%. The shot blasting equipment is basically the same, and only some auxiliary devices are needed to more strictly control the shot blasting process.
