The influence of steel shot and steel grit on shot blasting strength

1. The hardness of steel shot and steel grit: When the hardness of steel shot and steel grit is higher than the hardness of the part, the change of its hardness value does not affect the shot blasting strength; when the steel shot and steel grit is softer than the part, if the shot blasting hardness value decreases, The shot blasting strength is also reduced. Liaoning alloy steel shot

2. Shot blasting rate: When the shot blasting rate increases, the shot blasting strength also increases, but when the rate is too high, the damage of steel shot and steel grit increases.

3. Steel shot and steel grit thickness: the larger the steel shot, the greater the impact kinetic energy and the greater the shot blasting strength, but the steel shot and steel grit consumption rate is reduced. Therefore, while ensuring the strength of shot blasting, small steel shot steel grit should be used. In addition, the size of shot blasting is also limited by the shape of the part. When there is a groove on the part, the diameter of the steel shot and steel grit should be less than half of the inner radius of the groove. Shot blasting particle size is often selected between 6~50 mesh.

4. Projection angle: When the steel shot and steel sand jet is perpendicular to the appearance to be sprayed, the steel shot and steel sand have high strength, so it should be kept in this form for shot blasting. If limited by the shape of the part, when small angle shot blasting is necessary, the size and speed of steel shot and steel grit should be appropriately increased.

5. The amount of broken steel shot and steel grit: The kinetic energy of steel shot and steel grit fragments is low. The more broken steel shot and steel grit, the lower the shot blasting strength, and irregularly broken steel shot and steel grit will scratch the appearance of the part, so it should be Remove steel shot and steel grit every day to ensure that the shot blasting complete rate is greater than 85%. The shot blasting equipment is basically the same, only some auxiliary devices are needed to more strictly control the shot blasting process.

Steel shot steel grit has good impact performance. It is not as durable as steel shot steel grit with high hardness as some steel shot steel grit manufacturers say, it is good steel shot steel grit. In fact, this point of view is very paranoid, because as long as the hardness of the steel shot and steel grit increases, the toughness of the steel shot and steel grit will decrease accordingly, and the hardness of the steel shot steel grit will increase, and it is easy to break during the shot blasting process. The workpiece is not suitable for steel shot and steel grit with high hardness, but suitable for steel shot and steel grit with good toughness.

To obtain the ideal steel shot steel grit, the hardness and impact toughness of the steel shot steel grit must be considered comprehensively. That is to say, while the steel shot steel grit has good hardness, it must be fully considered that the steel shot steel grit is subjected to a large amount of impact load. When acting, its impact resistance mainly depends on the size of the impact toughness, and under the condition of multiple impacts with small energy, its impact resistance mainly depends on the strength and plasticity of steel shot and steel grit.