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The choice of sand blasting equipment
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The choice of sand equipment
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, workpiece size set equipment specification: according to the workpiece size selection engine room size, so that there is 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. (if there are conditions, it is recommended to use screw air compressor)
A, function or purpose
1. The cleaning on the surface of the workpiece can be used 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 tiny burrs, surface processing, such as the old part to remove the surface layer, show grey matrix, and the surface cleaning quality can achieve Sa3 level.
2. The surface coating pretreatment 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 rough surface, increasing the surface area so as to improve adhesion between the coating, coating and adhesive.
3. Change the physical and mechanical properties of the workpiece can change the stress state of the surface compressive stress, in particular, lubrication condition, 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
Surface access to the results of the three elements: the compressed air jet flow acceleration (the size of sand blasting pressure regulating) P abrasive type (S) of the spray gun distance (H), Angle (theta)
1. The size of the pressure regulating effect on surface results 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 usually 50 to 150 mm, the farther 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 type of abrasive on the result of the surface state of abrasive particles into the spherical, two types 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.
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