What to do with uneven sandblasting during sandblasting in Dalian

Sandblasting can remove all dirt such as rust from the surface of the workpiece, establishing a very important basic pattern (so-called rough surface) on the surface of the workpiece. By changing the size of the abrasive, different degrees of roughness can be achieved. Greatly improves the adhesion between the workpiece and the coating and coating materials. Or make the bonding part stronger and of better quality. Sand blasting can remove all dirt (such as oxide skin, oil stains, etc.) from the surface of castings and forgings, and after heat treatment, polish the surface of the workpiece, improve its smoothness, and play a role in beautifying the workpiece.

Sandblasting is a method of using compressed air to blow out quartz sand at high speed to clean the surface of parts. Factories, also known as sand blowing, not only remove rust but also oil, making them very useful for painting. Commonly used to remove rust on the surface of parts; Used to modify the surface of parts (small wet sandblasting machines sold on the market are designed for this purpose, where sand is usually corundum and the medium is water); The application of high-strength bolt connections in steel structures is a better method because high-strength connections use friction between joint surfaces to transmit force, and the quality requirements of joint surfaces are very high, which is very important for welding surfaces to be sandblasted.

What to do with uneven sandblasting during sandblasting in Dalian

1、 The distance difference between the nozzle and the surface of the workpiece is too large. When the nozzle of the spray gun is close to the surface of the workpiece, although the spraying range is small, it is relatively concentrated and appears dense. When the nozzle of the spray gun is far from the surface of the workpiece, although there is still so much sand sprayed, the area sprayed expands, and it will appear sparse at this time. During the sandblasting process, it is necessary to slowly grasp the appropriate distance, so that the sand sprayed out is uniform and the force is suitable.

2、 The walking speed of the spray gun is unstable during the stainless steel sandblasting process. When the walking speed of the spray gun is slow and when the walking speed is fast, the sand sprayed by the two is the same per unit time, but the distribution area of the sand is smaller compared to the former, and then larger. Due to the same amount of sand distributed on different sandblasting surfaces, the phenomenon of varying density is caused.

3、 The air pressure of the equipment is unstable during operation. When an air compressor is used for multiple spray guns, or when the air pressure and flow rate of the air compressor are insufficient, it is difficult to stabilize the air pressure. When the air pressure is high, more sand is sucked in and sprayed out, while when the air pressure is low, the opposite is true, meaning that the amount of sand sucked in and sprayed out is less. When a large amount of sand is sprayed, the sand surface appears dense, while when a small amount of sand is sprayed, the sand surface becomes sparse.

During construction, after various sandblasting equipment and materials are ready, start the air compressor, adjust the pressure to 5-6 K/cm2, open the valve, and send air to the sandblasting machine for wear protection of the sandblasting machine operator. Adjust the ventilation of the clothes. After the signal is turned on, open the switch to send air and sand. The sandblasting personnel hold a gun and place the gun head close to the workpiece to start sandblasting. Special nozzles are used for internal and external corners. In principle, sandblasting should be carried out sequentially from one end to the other.