In the fields of metal surface treatment, mold cleaning, and precision parts processing, liquid automatic sandblasting machines, thanks to their high efficiency and environmentally friendly features, have gradually become a vital piece of equipment for companies to improve product quality. Compared to traditional dry sandblasting machines, liquid automatic sandblasting machines use a mixture of abrasive and liquid to spray, reducing dust pollution and achieving a more refined surface treatment effect. In actual operation, pressure regulation and workpiece handling procedures are crucial to maximize the performance of the equipment. Mastering these key points is crucial to fully utilize the liquid automatic sandblasting machine in production.
The pressure regulation of a liquid automatic sandblasting machine directly impacts the blasting effect and workpiece quality. The machine's pressure system typically consists of a pump, pressure gauge, and pressure regulating valve. The operator must precisely adjust the pressure based on factors such as the workpiece material and surface treatment requirements. For workpieces with higher hardness, such as stainless steel and alloy steel, higher pressure is often required to enhance the impact of the abrasive. Generally, a pressure setting of 5-8 MPa is recommended to effectively remove scale and rust from the workpiece surface. For softer metals like aluminum and copper, or for precision components, the pressure should be lowered to 2-4 MPa to avoid surface damage caused by excessive pressure. Furthermore, the pressure of the liquid automatic sandblasting machine is also dependent on the abrasive type. When using coarser-grit abrasives, lowering the pressure appropriately can prevent overblasting. Conversely, when using fine-grit abrasives for fine polishing, the pressure should be increased appropriately to ensure the abrasive's cutting ability.
The workpiece processing process is another important step to ensure the efficient operation of the liquid automatic sandblasting machine. The first is the pretreatment stage. Before entering the sandblasting process, the workpiece needs to be thoroughly cleaned and degreased. If there are residual oil and impurities on the surface of the workpiece, the adhesion of the coating after sandblasting will decrease, affecting the subsequent effect. When an automotive parts manufacturer uses a liquid automatic sandblasting machine to process the wheel hub, it adds an ultrasonic cleaning process to clean the grease and debris on the surface of the wheel hub, which increases the adhesion of the coating after subsequent sandblasting by 30%. After the pretreatment is completed, the appropriate clamping method needs to be selected according to the shape and size of the workpiece. For small parts, dedicated fixtures can be used for batch fixing. For large workpieces, a suspension device or support platform is required to ensure that the workpiece remains stable during the sandblasting process to avoid uneven sandblasting due to shaking.
Once the sandblasting phase begins, operators must strictly adhere to process parameters. The distance and angle between the liquid automatic sandblasting machine's spray gun and the workpiece also affect the blasting effect. Generally, the spray gun should be kept 10-15cm from the workpiece surface, and the angle should be controlled between 45° and 60°. This ensures that the abrasive fully impacts the workpiece surface while avoiding localized overblasting. Furthermore, the equipment's circulation system recycles and filters the used abrasive and liquid mixture, removing impurities before returning it to service. During this process, the filter should be regularly checked for clogging to prevent impurity accumulation that could affect the sandblasting pressure and effectiveness.
After the workpiece has been sandblasted, the post-processing process should also not be neglected. First, the workpiece must be thoroughly rinsed with clean water to remove any residual abrasive and liquid on the surface, preventing secondary corrosion caused by residual substances. Drying can then be performed. Hot air drying or natural drying can be used to ensure that there is no water residue on the workpiece surface. For workpieces that require further coating, coating should be applied as soon as possible after drying to prevent re-oxidation of the workpiece surface. A mold manufacturing company has improved the rust resistance of the mold surface by 50% by optimizing the post-processing process of the liquid automatic sandblasting machine, significantly extending the service life of the mold.
As the manufacturing industry continues to demand higher surface quality, the use of liquid automatic sandblasting machines will become more widespread. Mastering the key points of pressure regulation and workpiece handling processes will not only improve equipment efficiency, but also save costs and enhance product competitiveness. In the future, with the integration of intelligent technologies, liquid automatic sandblasting machines are expected to implement functions such as automatic pressure regulation and intelligent workpiece identification, further simplifying the operating process and promoting the development of surface treatment processes to a higher level.