The difference between sandblasting and shot blasting

　　shot blasting

　　Shot blasting is to use a high-speed rotating impeller to throw small steel shot or small iron shot out to hit the surface of the part at high speed, so the oxide layer on the surface of the part can be removed. At the same time, the steel shot or iron shot hits the surface of the part at high speed, causing the lattice distortion on the surface of the part to increase the surface hardness. It is a method of cleaning the surface of the part. Shot blasting is often used to clean the surface of the casting or strengthen the surface of the part deal with

　　In fact, the cleaning of castings is not only by shot blasting. For large parts, the drum is generally cleaned first, that is, the riser of the casting is cut off and then rolled in the drum. The parts collide with each other in the drum, and most of the sand on the surface is removed first. Cleared and then shot blasting or shot peening.

　　sandblasting

　　Sandblasting is a method of using compressed air to blow out quartz sand at high speed to clean the surface of parts. It is also called sand blowing in the factory. It not only removes rust, but also removes oil along the way, which is very useful for painting. It is often used to remove rust on the surface of parts; to modify the surface of parts (small wet sandblasting machines sold in the market are used for this purpose, the sand is usually corundum, and the medium is water); in steel structures, the application of high-strength bolts for connection is a relatively advanced Since the high-strength connection uses the friction between the joint surfaces to transmit force, the quality of the joint surface is very high, and the joint surface must be treated with sandblasting.

　　Sandblasting is used for complex shapes, easy to remove rust by hand, low efficiency, bad on-site environment, and uneven rust removal. General sandblasting machines have sandblasting guns of various specifications. As long as the box is not particularly small, the guns can be put in and cleaned. The supporting product of the pressure vessel - the head adopts sand blasting to remove the oxide scale on the surface of the workpiece, and the diameter of the quartz sand is 1.5mm to 3.5mm.