What is the medal that sparkles and looks very high-end?
Metals are in close contact with the air all year round, and processes are usually added to the surface of medals, trophies, commemorative medals, etc. to provide certain protection for metal products.
The following are the 2022 Winter Olympics medals, which have been sandblasted on the surface. Today, let’s introduce common sandblasting techniques.
Sandblasting is a process of surface treatment for workpieces. Using compressed air as the power, a high-speed jet beam is formed to spray materials (copper ore, quartz sand, diamond sand, iron sand, sea sand) at high speed onto the surface of the workpiece to be treated, causing changes in the appearance or shape of the workpiece surface. Due to the impact and cutting effects of abrasives on the surface of the workpiece, the surface of the workpiece obtains a certain degree of cleanliness and different roughness, which improves the mechanical properties of the workpiece surface. Therefore, the fatigue resistance of the workpiece is improved, the adhesion between it and the coating is increased, the durability of the coating is extended, and it is also conducive to the leveling and decoration of the coating.
Raw materials for sandblasting treatment
Sandblasting: A technical term used in the casting of gold and silver coins. On the production mold of gold and silver coins, various sizes and models of metal sand particles are used to spray the pattern part into an extremely fine frosted surface. When producing gold and silver coins, a beautiful texture appears on the pattern part, increasing the sense of dimensionality and layering. Sandblasting: (referring to the removal of rust on metal surfaces or plating on metal surfaces) is divided into ordinary quartz sand and refined quartz sand: with high hardness and good rust removal effect.
Sandblasting process
Pre processing stage
The pre-treatment stage of the process refers to the treatment that should be carried out on the surface of the workpiece before being sprayed or coated with a protective layer. The quality of pre-treatment in sandblasting technology affects the adhesion, appearance, moisture resistance, and corrosion resistance of coatings. If the pre-treatment work is not done well, rust will continue to spread under the coating, causing the coating to peel off in pieces. After careful cleaning of the surface and general simple cleaning of the workpiece, the coating life can be compared by 4-5 times using the sun exposure method. There are many methods for surface cleaning, but the most commonly accepted ones are solvent cleaning, acid washing, manual tools, and manual tools.
Process stage
The sandblasting process uses compressed air as the power to form a high-speed jet beam, which sprays materials and other materials onto the surface of the workpiece to be treated at high speed, causing changes in the surface of the workpiece. Due to the impact and cutting effects of abrasives on the workpiece surface, the workpiece surface obtains a certain degree of cleanliness and different roughness, improving the mechanical properties of the workpiece surface.
The benefits of sandblasting technology
（1） Coating and bonding pre-treatment sandblasting can remove all dirt such as rust on the surface of the workpiece, and establish a very important basic pattern (commonly known as rough surface) on the surface. It can also achieve different degrees of roughness by exchanging abrasives of different particle sizes, such as flying abrasive tools, greatly improving the bonding strength of coatings and coatings. Or make the bonding of the adhesive parts more firm and of better quality.
（2） The rough surface of castings and the cleaning and polishing after heat treatment can be cleaned by sandblasting, which can remove all dirt (such as oxide skin, oil stains, etc.) on the surface of forged and heat-treated workpieces. The surface polishing can improve the smoothness of the workpiece, exposing a uniform and consistent metallic color, making the appearance more beautiful and attractive.
（3） Burr cleaning and surface beautification sandblasting can clean small burrs on the surface of workpieces, make the surface of workpieces smoother, eliminate the harm of burrs, and improve the grade. And sandblasting can create very small rounded corners at the interface of the workpiece surface, making it more beautiful and precise.
（4） After sandblasting, uniform and fine concave convex surfaces can be generated on the surface, allowing lubricating oil to be stored, thereby improving lubrication conditions and reducing noise to increase service life.
（5） For certain special purpose workpieces, sandblasting can achieve different reflections or matte effects at will. Such as polishing stainless steel workpieces and plastics, polishing jade objects, matte surface treatment of wooden furniture, pattern patterns on frosted glass surfaces, and roughening of fabric surfaces.
Overall, it makes the gold medal appear more advanced, durable and durable
Post time: May-27-2024
