8 Main Applications of Abrasive Blasting
The abrasive blasting process is to use compressed gas to spray blasting materials onto the surface of the workpiece by means of high-speed air pressure (commonly used blasting materials include copper ore sand, quartz sand, emery, iron sand, Hainan sand, etc.) Under the impact and cutting of the spray material on the surface of the workpiece, the surface can obtain a certain degree of cleanliness (such as rust removal). At the same time, the fatigue resistance of the workpiece is also improved.
Abrasive blasting will form a certain roughness on the surface, increase the adhesion between it and the coating, prolong the durability of the coating film, and also help the smoothing and decoration of the coating. In other words, the abrasive blasting process is mainly to treat the surface of the material, so that other coatings can be better absorbed on the surface of the material. The same abrasive blasting process can produce a special metallic flash effect on the surface of the workpiece. So, what are the main applications of abrasive blasting?
1. Abrasive blasting process to remove the oxide skin
The oxide scale and residual salt after heat treatment can be cleaned by abrasive blasting. At the same time, it can improve the surface finish of the parts, especially for the molds with complex shapes and precision parts, the abrasive blasting effect is more prominent.
2. Clean the rough surface of precision castings
Abrasive blasting is the most economical and effective method to clean the oxide scale and residues on the surface of precision castings, especially the cleaning and polishing of precision castings with complex shapes and no allowance. At the same time, it can play a polishing role and improve the surface finish of the casting.
The use of abrasive blasting to clean the stamping parts can make the parts reveal the metal color of the same color, make the appearance of the parts more beautiful, and also improve the surface hardness and corrosion resistance of the parts. Such as CNC precision parts, various instrument shells, frames, jewelry, etc.
For sand casting aluminum, copper, and other metals, abrasive blasting can also achieve higher surface quality and save many intermediate process links.
3. Remove microburrs from machining workpieces
Although the burr is small, it is very harmful. With the advancement of science and technology, mechanical parts are becoming more and more complex, the precision requirements are getting higher and higher, the application conditions are very strict, and no burrs are allowed. Such as the 3C communication industry, textile machinery parts, hydraulic components, precision and complex parts of the aerospace industry, medical equipment, CNC aluminum alloy precision parts, etc.
The use of abrasive blasting to remove burrs has high efficiency and high quality and can make small rounded corners appear at the junction of the two surfaces (which is required by many mechanical parts). If the process parameters can be reasonably selected, the original surface brightness can be also improved.
4. Prepare for other surface treatment processes
Abrasive blasting pretreatment is used before electroplating parts, and the electroplating layer has strong adhesion, especially for hard chrome plating. Such as screw electrophoresis, bolt nickel plating, etc.
The use of abrasive blasting before spraying can enhance the coating adhesion of painted parts and sprayed parts. The bonding parts are of good quality and firmer bonding by abrasive blasting.
Anti-corrosion coating for double-headed screws is sprayed red
5. Surface decoration by the abrasive blasting process
Abrasive blasting is an effective process for parts that require a smooth surface and do not allow reflection, such as surgical instruments.
Abrasive blasting is also widely used in frosted glassware and patterns, instrument panels, the processing of the sand surface of plastic drawing paper, the mirror surface of the single crystal silicon surface, and the plush processing of special fabrics.
6. Use abrasive blasting to clean up dirt and rust stains
Various molds such as forging molds, stamping molds, rubber molds, tire molds, plastic compression molds, glass product molds, etc., will inevitably be contaminated with mold release agents and other dirt and burn marks after a period of use. Abrasive blasting is very effective, and at the same time, it can improve the service life of the mold. The use of abrasive blasting for food molds can meet the medical sterilization requirements.
The use of abrasive blasting can improve the pressure resistance of ceramic components in the electronic industry, and the use of abrasive blasting technology to refurbish old mechanical parts and auto spare parts can achieve the effect of looking like new.
7. Use abrasive blasting process for finishing
Abrasive blasting works very well as a finishing method, especially for parts with complex shapes. For example, the polishing of impeller engine blades and various mold surfaces (commemorative coin molds) is unmatched by any other method. Abrasive blasting ceramic, diamond, gold, and silver jewelry is the most economical method.
8. Improve the performance of mechanical parts
After the mechanical parts are sandblasted, in addition to improving the smoothness by 0.5-1 grade on the original basis, the sprayed surface has microscopic uniform pits, which can maintain the storage of lubricating oil and improve the lubricating conditions. Therefore, the service life of the parts can be prolonged, and the noise of the mechanical operation can be reduced. Such as gears, crankshafts, textile machinery, sewing machinery, etc.
After abrasive blasting of mechanical parts, especially after liquid shot peening, the fatigue strength and corrosion resistance of the parts can be significantly improved. Such as springs, turbine blades, etc.
Small defects on the surface of mechanical parts and castings are easily exposed after sandblasting. It is helpful for inspection and flaw detection of parts cracks.
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