Selection Of Rotary Joint Hollow Shaft Material
Rotary joint commonly used carbon steel materials are 45 and 50 steel, after quenching has a higher hardness and good wear resistance, suitable for chemical neutral medium. Rotary joint hollow shaft generally according to the use of conditions and fluid media often use carbon structural steel, high-quality carbon steel seamless steel pipe, the friction surface of the heat treatment to improve the hardness and strength, increase wear resistance. For the surface of the parts plating to improve corrosion resistance. Petroleum cracking and boiler seamless steel pipe is also often used as the selected material, but the material used for neutral media occasions. Stainless acid resistant seamless steel pipe corrosion resistance is strong, but the wear resistance is poor, in order to improve the hardness of the friction surface, the need for heat treatment or in the sealing surface surfacing layer of cemented carbide.
To improve the hardness of carbon steel and wear resistance, is now widely used in the rotary joint sealing surface surfacing carbide. Surfacing carbide gas electrode material. Surfacing carbide alloy welding rod material has good resistance to cavitation and corrosion resistance, with high hardness and corrosion resistance, with high temperature, high pressure to maintain high hardness characteristics.
It may be said that in recent years, the life expectancy of the rotary joint has increased many times over the past, due to the use of better materials and advanced structure, in addition, there are maintenance personnel on this form of the seal has been mastered Very good.
Usually the life of the rotary joint depends not only on the wear of the end face and the spherical surface, but also on the aging properties of the rubber and plastic materials used. The amount of carbon ring wear is only 0.35mm at break time.
Contact pressure, friction coefficient, sliding speed and temperature of any degree of increase and intermittent conditions will reduce the service life. In addition to wear and tear, there are abrasive wear, corrosion wear and erosion wear and vibration, temperature and material factors such as loading the instrument affect the life of the rotary joint so that the life of the rotary joint data is always unreliable, Said that the confidence interval of the estimated life of the rotary joint is low. In recent years, through a large number of experiments with different theories, from different angles to predict wear life.