Wide application of tungsten carbide thermal spraying

       Wide application of tungsten carbide thermal spraying in paper industry



In the 21st century, the carton packaging industry is developing rapidly in our country. Fierce market competition makes carton companies consider product quality and business costs more. As the heart component of the production line, corrugated rollers play an important role in carton quality and economic benefits. With a pivotal role, traditional corrugating rollers have become increasingly unable to meet their needs. In recent years, foreign high-quality corrugated rollers have entered the Chinese market one after another. Tungsten carbide corrugated rollers are a special process that uses thermal spraying technology to melt and spray tungsten carbide alloy powder onto the tooth surfaces of the corrugated rollers to form a tungsten carbide coating. The following will specifically introduce the application of thermal spraying technology, the spraying process of tungsten carbide corrugated rollers, the elements to ensure the quality of tungsten carbide corrugated rollers, and the advantages of tungsten carbide corrugated rollers (compared with traditional ordinary corrugated rollers).





Thermal spray technology application





Thermal spraying is a process in which the thermal spraying material is melted by heat energy, and the thermal spraying material is atomized by the power of the heat source or applied with high-pressure air and sprayed on the surface of the workpiece at a certain speed to form a coating. The functions of abrasion resistance, heat resistance, corrosion resistance, anti-electromagnetic interference, and decoration under various conditions have been strengthened. There are many types of thermal spraying. Among them, the best coating quality should be "supersonic flame spraying". This spraying method has been successfully used in my country's aerospace, steel, petrochemical, oil field, textile, shipbuilding and other industries for many years, greatly improving the workpiece Performance. Applying this technology to corrugating rollers, due to the particularity of the corrugating roller's operating conditions and tooth profile, it is difficult to develop.





Tungsten carbide corrugated roller spraying process





Matrix pretreatment is different from other corrugated rollers, it needs to be formulated according to the thermal spraying process conditions, and the tooth profile processing needs to consider the thermal spraying margin to complete the forming on the CNC corrugated roller grinder. The quality of the surface cleaning and roughening of the substrate is the basis for obtaining a good coating. The cleaning work increases the bonding of the coating. The uniform angularity of the roughening is beneficial to the mechanical locking effect. The increase in surface deposition also further improves the bonding strength of the coating. The sprayed tungsten carbide layer has a very high surface hardness and cannot be ground with a general grinding wheel. It must be finished with a special polishing process to ensure accurate flute shape.