What factors will affect the sandblasting effect of sandblasting machine for metal spraying

Spray processing tool is more than one, some spray processing manufacturers will use sandblasting machine for sandblasting. The roughness of the workpiece surface is related to the strength and hardness of the part material, and has a great relationship with the sandblasting diameter and angle of the machine. The higher the strength of the part material, the higher the hardness of the surface, so the plastic deformation of the sprayed product becomes more difficult. Sandblasting plays an important role in surface grinding. The rougher the surface is after sandblasting, the smoother the surface will be.

1. The factors that affect the surface roughness include the strength and hardness of the part material, the diameter of sandblasting, the angle and speed of sandblasting, and the original surface roughness of the part. Under the same conditions, the higher the strength and surface hardness of parts, the more difficult the plastic deformation, the shallower the crater, and the smaller the surface roughness; The smaller the diameter and the slower the speed of sandblasting, the shallower the crater and the smaller the surface roughness; The larger the angle of spraying, the smaller the normal component of sandblasting velocity, the smaller the impact force, the shallower the crater, the greater the tangential velocity of sandblasting, the greater the abrasive effect of sandblasting on the surface and the smaller the surface roughness. The rougher the original surface is, the smaller the rougher the surface will be; On the contrary, the smoother the surface is, the rougher the surface becomes after sandblasting. When the parts are sandblasted with high intensity, the deep crater not only increases the surface roughness, but also forms large stress concentration, which seriously weakens the effect of sandblasting.

2. The main process parameters that affect the sandblasting strength are: sandblasting diameter, sandblasting flow rate, sandblasting flow rate, sandblasting time, etc. The larger the diameter of sand blasting is, the faster the speed is, and the greater the momentum of collision between sand blasting and workpiece is, the greater the intensity of sand blasting is. The residual compressive stress formed by sandblasting can reach 60% of the tensile strength of the part material, and the depth of residual k stress layer is usually 0.25 mm, and the limit value is imm. Sandblasting strength needs a certain sandblasting time to ensure that after a certain period of time, the sandblasting strength reaches saturation, and then extend the sandblasting time, the strength will not increase significantly. In the Almen test of sandblasting strength, the characterization of sandblasting strength is the improvement of specimen deformation. The strength of sandblasting is related to the diameter of sandblasting, the speed and flow of sand flow, and the time of sandblasting. By controlling the momentum of sandblasting and workpiece collision through these parameters, the strength of sandblasting can be enhanced, and the residual stress formed by sandblasting can also act on the material of parts to enhance its tensile strength. Whether the roughness of the workpiece surface or the sandblasting strength of the sandblasting machine is one of the factors affecting the spraying effect, we need to use the spraying equipment correctly to complete the beautification process of the equipment.