Steel pretreatment line manufacturers outline the process content of shot blasting in the shot blasting machine
In the shot blasting machine operation process, there will generally be shot blasting this step, we can call it shot blasting treatment, it is an important part of the shot blasting machine to achieve the function, then the shot blasting treatment, what are the process? And what are the knowledge points? Please see the following introduction.
1. Purpose
Eliminate the tensile stress on the surface of the part, while generating compressive stress, thereby improving the fatigue strength of the part.
2. Use range
The use temperature of steel parts does not exceed 260℃, and the use temperature of aluminum parts does not exceed 170℃, if the temperature is exceeded, the shot blasting process is not required.
3.Process
The choice of the type of shot: you can choose cast steel shot and cast iron shot, the former hardness of HRC40-50, toughness is better; the latter hardness of HRC58-65, brittle texture, so easy to break, mainly for blasting strength is relatively high occasions.
Shot size selection: including shot size and shot size, shot size is generally selected between 6 and 50 mesh, the higher the shot strength, the larger the shot size. The size of the shot should be selected according to the size of the part, but note that the diameter of the shot should not be greater than half of the inner diameter of the groove. In the premise that can meet the strength of the shot, the size of the shot should be reduced as much as possible.
4. The choice of shot hardness
It is required that the hardness of the shot should be greater than the hardness of the part.
5. The choice of blasting speed
If you increase the blasting speed, it will increase the strength of the shot, but if the speed is too fast, it will increase the consumption of the shot, so you should choose the appropriate.
6. Adjustment of spraying angle
When the angle of spraying is vertical, its strength, so this angle is generally used. If the shape of the part is restricted, it should be carried out at a small angle, which can be appropriate to increase the speed of blasting.
7. Blasting time
It is based on the blasting effect to decide, in principle, is to achieve the required blasting effect on it, too long and too short are not good.