Sand blasting process
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• sandblasting equipment choice
1, generally speaking, the main effect of sandblasting from parts material and the sandblasting abrasive decision. According to different parts material, sandblasting abrasive range from the effects of the strong metal abrasive to the effect of soft resin abrasive, dry sand and sand liquid is also focused on the problem of the consideration.
2, determine the efficiency of production equipment types:
According to choose automated sandblasting processing capacity production line, semi-automatic sandblasting equipment, pressure into the type sand blasting machine, inhaled sandblasting machine.
3, determine the workpiece size equipment specifications:
According to the workpiece size selection engine room size, in order to have enough space to complete the work.
4, compressed air requirements:
According to determine the capacity of air compressor equipment specifications, and 20% allowance, in order to protect the air compressor service life.
A, function or purpose
1. Surface cleaning
Available against the corrosion of the metal layer, on the surface of the heat treatment of residual salt and oxide layer and oxide layer on the surface of the rolled piece, oxide layer on the surface of the forging parts, welding parts, casting surface oxide layer on the surface of the sand and the residual dirt on the surface of the oxide layer, and the tiny burrs, surface processing, such as the old part to remove the surface layer, show matrix ecru, cleaning the surface quality can achieve Sa3 level.
2. The surface pretreatment before coating
Can be used for a variety of electroplating process, brush plating process and coating process and bonding technology of pretreatment process, in order to obtain active surface, improve the adhesion between the coating, coating and adhesive.
3. Change the physical and mechanical properties of the workpiece
Can change the stress state of the workpiece surface lubrication conditions, to improve the matching couple reduce accidentally a noise in the process of movement. Can make the surface hardening, improve wear resistance and fatigue strength of parts.
4. The surface finishing processing
Can change the workpiece surface roughness Ra value. Can produce inferior smooth or diffuse surface of workpiece, in order to achieve the goal of finishing processing.
Second, the main parameters
Main parameters affecting sandblasting processing: types of abrasive, abrasive particle size, concentration of grinding fluid, jet distance, jet Angle, jet time, compressed air pressure, etc.
Three, environmental protection features
1. Greatly improve the dust pollution to the environment and the harm to workers health.
2. Can be directly installed on the production line, save the production area, good workpiece turnover.
3. Flexible working methods, variable process parameters, can adapt to different material and different finishing processing requirements of precision parts.
4. In the working process of the abrasive recycling, some consumption
5. The main parts service life is long, and easy maintenance.
Commonly used sand blasting process parameters
The surface of the access to the results of three elements:
Compressed air for the acceleration of jet stream (the size of sand blasting pressure regulating) P
The type of abrasive (S)
Lance distance (H), Angle (theta)
1. The size of the pressure regulating the impact of the result of the surface
In S, H, theta after three volume Settings, P value is, the higher the speed of the jet stream, the higher the efficiency of sandblasting, the rough surface processing, on the contrary, the relatively smooth surface.
2. The distance of the gun, the influence of the Angle change on the surface of the results
After the P, S value is set, the key for manual sand blasting technology, spray gun from the workpiece is commonly 50-150 - mm, spray gun from the workpiece, the lower the efficiency of the jet stream, the smooth the surface. Spray gun and artifacts of the smaller the Angle, the lower the efficiency of the jet stream, the workpiece surface is smooth.
3. The abrasive types on the result of the surface
State of abrasive particles into the spherical, two kinds of diamond, sandblasting usually adopts silicon carbide (white steel jade, corundum) for the diamond abrasive. Spherical glass beads as abrasive. In P, H, theta three value Settings, spherical abrasive blasting by the results of a smooth surface, the diamond abrasive surface are relatively rough, but the same kind of abrasive and thickness, according to the number of mesh division domestic abrasive degree of thickness, generally called the number, the higher the number, and the smaller the particle size, P, H, theta value set, the higher the serial number of the same kind of abrasive blasting, the surface of the obtained result is more smooth.
