CNC lathe processing factory sandblasting process

Sandblasting is a surface treatment process in which the dry sand stream is strongly sprayed onto the surface of metal parts with purified compressed air to remove dirt. The compressed air is used as the power to form a high-speed spray beam to spray the spray material on the surface of the workpiece to be treated at a high speed, so that the appearance or shape of the outer surface of the workpiece surface changes. Due to the impact and cutting effect of the abrasive on the workpiece surface, the workpiece surface is The surface obtains a certain degree of cleanliness and different roughness, which improves the mechanical properties of the workpiece surface, thus improving the fatigue resistance of the workpiece, increasing the adhesion between it and the coating, and prolonging the durability of the coating film. It is also beneficial for the leveling and decoration of paints.

The benefits of workpiece sandblasting

(1) Improve the mechanical properties of the parts. After sandblasting, the mechanical parts can produce uniform and fine concave and convex surfaces on the surface of the parts, so that the lubricating oil can be stored, thereby improving the lubricating conditions, reducing noise and increasing the service life of the machine.

(2) Lighting effect For some special-purpose workpieces, sandblasting can achieve different reflections or matts at will.

(3) Cleaning and polishing of the rough surface of castings and workpieces after heat treatment Sandblasting can clean all dirt (such as oxide scale, oil and other residues) on the surface of castings and forgings and workpieces after heat treatment, and polish the surface of the workpiece to improve the smoothness of the workpiece , can make the workpiece reveal a uniform and consistent metal color, so that the appearance of the workpiece is more beautiful.

(4) Sandblasting before workpiece coating and workpiece bonding can remove all dirt such as rust on the surface of the workpiece, and can achieve different degrees of roughness by replacing abrasives with different particle sizes, which greatly improves the quality of workpieces and coatings and plating materials. bonding force; or make the bonding parts more firm and better in quality.

(5) Burr cleaning and surface beautification of machined parts Sandblasting can clean the tiny burrs on the surface of the workpiece and make the surface of the workpiece smoother, eliminating the harm of burrs and improving the grade of the workpiece. At the same time, sandblasting can make small rounded corners at the junction of the workpiece surface, making the workpiece more beautiful and more precise.

Sandblasting materials and precautions

The sand used for sandblasting is generally quartz sand, or emery and steel shot (correspondingly called shot peening). The type and size of the sand are selected according to the surface state and processing requirements of the parts. In order to prevent the oil from contaminating the sand, contaminating the machined surface and blocking the nozzle, the parts with excessive oil on the surface should be de-oiled and dried before sandblasting, and the compressed air sent to the sandblasting machine should also be filtered and purified. Pay attention to the pressure of the air because the pressure is large, the flow rate of the sand particles is large, and it is easy to be broken, which will affect the production capacity of sandblasting. The angle between the sand flow and the surface of the part being machined also has a great influence on the blasting effect.

How to prevent the blockage or damage of the workpiece teeth caused by sandblasting?

Before sandblasting, the protective screw plug is screwed into the threaded hole to prevent the high-speed sandblasting flow from damaging the internal thread during sandblasting; The inner thread of the threaded hole is protected from damage during processing.