What are the effects of sand blowing distance, angle and time on the surface properties of the substrate

       The change of the sand blowing distance has the greatest influence on the sand blowing efficiency, followed by the influence of the surface roughness of the body. Generally, the surface hardness of the substrate is greater than 45HRC, the sand blowing distance is 100mm~150mmmm, and the surface hardness of the substrate is between 25HRC~45HRC, and the sand blowing distance is 150mm~200mm, the surface hardness of the soft substrate is less than 150HB, and the sand blowing distance is 250mm~300mm.



     The change of the sand blowing angle mainly affects the roughness of the surface of the substrate. When the sand blowing angle changes from 30° to 75°, the roughness increases with the increase of the sand blowing angle, but the best sand blowing angle is 70°~ 80°.

     The change of sand blowing time has a great influence on the activation degree of the surface of the substrate. Generally, the surface activity increases with the increase of the sand blowing time for fixing the workpiece, but when the sand blowing time reaches about 20S, the surface activity basically reaches saturation. Generally, the surface roughness of the substrate reaches Sa3 level, and the sand blowing time is about 5S~10S.