Sand blasting technology for removing oxide scale.
After heat treatment, the oxide scale and residual salt can not only be removed by sandblasting, but also improve the surface smoothness of parts, especially for molds and precision parts with complex shapes. For example, sandblasting after heat treatment can not only damage the cutting edge of the file, but also improve its service life.
After hot rolling, various rare metal plates can also be cleaned by sandblasting to prepare for cold rolling and improve the surface quality of plates.
Clean the rough surface of precision castings.
Sand blasting is the most economical and effective method to clean the scale and residue on the surface of precision castings, especially for cleaning and polishing precision castings with complex shapes and no allowance. At the same time, it can play a role in polishing and improve the surface smoothness of castings; For example: aero-engine turbine blades, surgical instruments, jewelry, etc.
Cleaning die castings by sandblasting can make the parts appear the same metallic color and make the appearance of the parts more beautiful. If the liquid shot peening effect is good, the surface hardness and corrosion resistance of the parts can be improved. Such as: various musical instrument shells, picture frames, jewelry, etc.
For aluminum, copper and other metals cast in sand mold, sandblasting can also achieve higher surface quality, which saves many intermediate process links.
3. Remove the tiny burr of the machined workpiece.
Although the burr is small, it is very harmful. With the progress of science and technology, mechanical parts are becoming more and more complex, and the requirements for accuracy are getting higher and higher. The application conditions are very strict. Burrs are not allowed, such as 3C communication industry, textile machinery parts, hydraulic components, precision and complex parts of aerospace industry, medical instruments, castings on dentures, etc. Sandblasting has high efficiency and good quality, which can make a small fillet appear at the joint of two surfaces (which is required by many mechanical parts)
Prepare for other surface treatment processes.
Parts are pretreated by sandblasting before electroplating, and the electroplating layer has strong adhesion, especially hard chromium plating. For example: chromium plating of engine piston ring, pear-shaped surface of silk roller of textile machine, etc.
For painting parts and spraying parts, sandblasting before spraying can enhance the adhesion of the coating; The bonded parts are bonded by sandblasting, with good quality and stronger bonding.
5. Surface decoration sandblasting process.
Sandblasting is an effective process for parts that need smooth surface and are not allowed to reflect light, such as surgical instruments.
Others, such as frosted glassware and patterns, the processing of sand surface of dashboard and plastic wire drawing paper, the mirror surface of monocrystalline silicon, and the plush processing of special fabrics, are widely used.
The main application of sandblasting technology is to clean dirt and rust.
Various molds, such as forging molds, stamping molds, rubber molds, tire molds, plastic compression molds, glass products molds, etc. After a period of use, it will inevitably be contaminated with dirt and release agent and other burn marks. The effect of sand blasting cleaning is very obvious, which can improve the service life of the mold. Sandblasting can meet the medical sterilization requirements of food molds;
Sand blasting can improve the pressure resistance of ceramic components in electronic industry; The old and new mechanical parts and auto parts can be turned over by sandblasting technology to achieve the effect of exchanging the old for the new.
7. Polishing treatment of sand blasting process
As a polishing method, sandblasting has an excellent effect, especially for the polishing of parts with complex surfaces, such as impeller engine blades and various mold surfaces (currency molds, incense coins, commemorative coin molds), which is unmatched by any other method. Sandblasting polishing ceramics, diamonds and gold and silver jewelry is the most economical method.
Improve the performance of mechanical parts
After sandblasting, not only the smoothness of mechanical parts can be improved by 0.5- 1 on the original basis, but also there are microscopic uniform pits on the sprayed surface, which can keep the storage of lubricating oil and improve its lubrication conditions, thus prolonging the service life of parts and reducing the noise of mechanical operation. Such as gears, crankshafts, textile machinery, sewing machinery, etc.
The fatigue strength and corrosion resistance of mechanical parts can be significantly improved by sand blasting, especially liquid shot blasting. Such as springs, turbine blades, etc.
Small surface defects of mechanical parts and castings are easily exposed after sandblasting, which is helpful for the inspection and flaw detection of parts cracks.