Wide application of tungsten carbide thermal spray

       Wide application of tungsten carbide thermal spraying in paper industry



In the 21st century, the carton packaging industry has developed rapidly in my country, and the fierce market competition has made carton companies pay more attention to product quality and business costs. Playing a pivotal role, traditional corrugating rollers have become increasingly unable to meet their needs. In recent years, foreign high-quality corrugating rolls have entered the Chinese market one after another. Tungsten carbide corrugating rolls are a special process that uses thermal spraying technology to melt and spray tungsten carbide alloy powder onto the tooth surface of the corrugating roll to form a tungsten carbide coating. The following will introduce the application of thermal spraying technology, the spraying process of tungsten carbide corrugated rolls, the elements to ensure the quality of tungsten carbide corrugated rolls, and the advantages of tungsten carbide corrugated rolls (compared with traditional ordinary corrugated rolls).





Application of thermal spraying technology





Thermal spraying is a process in which thermal spraying materials are melted by thermal energy, and the thermal spraying materials are atomized and sprayed onto the surface of the workpiece at a certain speed by the power of the heat source or by the addition of high-pressure air to form a coating. Strengthen the wear resistance, heat resistance, corrosion resistance, electromagnetic interference resistance, decoration and other functions under various conditions. There are many types of thermal spraying, among which the best coating quality should be "supersonic flame spraying". This spraying method has been successfully used in my country's aerospace, steel, petrochemical, oilfield, textile, shipbuilding and other industries for many years, greatly improving the workpiece. performance. Applying this technology to corrugated rollers has certain difficulties in research and development due to the particularity of the use conditions and tooth profiles of corrugated rollers.





Tungsten Carbide Corrugated Roller Spraying Process





The base pretreatment is different from other corrugated rolls, it needs to be formulated according to the thermal spraying process conditions, and the tooth profile processing needs to consider the thermal spraying allowance to complete the forming on the CNC corrugated roll grinder. The quality of cleaning and roughening of the surface of the substrate is the basis for obtaining a good coating. The cleaning work increases the adhesion of the coating. The uniform edge and corner state of the roughening is beneficial to the mechanical locking effect. The increase of surface deposition also further improves the bonding strength of the coating. Because the surface hardness of the sprayed tungsten carbide layer is very high, it cannot be ground with a general grinding wheel, and must be completed with a special polishing process to ensure accurate corrugation.