1. Carbon content The carbon in the nodular cast iron piston ring does not damage the mechanical properties like the gray cast iron ring. As long as there is no graphite floating, the choice of high carbon is beneficial: ① high carbon and many graphite crystal nuclei can refine...
The inoculant used in the production of nodular cast iron piston rings is a special mixed inoculant, which is composed of customized s inoculant and M inoculant in a certain proportion. The inoculation effect of single double piece nodular cast iron piston ring is obviously better than the commonly...
The pig iron with 40% ~ 100% of the above components and less than 60% of the return material are melted in a 150kg medium frequency furnace. Strengthen the operation process to ensure that the spheroidizing temperature of nodular cast iron reaches 1500 ~ 1550 ℃, and the time...
German experts have repeatedly stressed that “the key to the production of nodular cast iron piston rings lies in raw materials”. It is difficult to produce nodular cast iron piston rings without qualified raw materials. They emphasized the use of high-purity pig iron or synthetic pig iron. Its composition...
Nodular cast iron piston ring plays the role of sealing, heat transfer and support in the engine, so it is required that the piston ring has good wear resistance, elasticity and thermal stability, especially for one ring. The development and application of nodular cast iron piston ring is a...
After friction welding of existing 38MnVS6Ti non quenched and tempered steel and 42CrMo4 quenched and tempered steel pistons, if only stress relief annealing treatment is carried out, the hardness of the heat affected zone of the weld seam after annealing will be higher, that is, the hardness of the...
Compared with 38MnVS6Ti non quenched and tempered steel and 42CrMo4 quenched and tempered steel, nodular cast iron material has the characteristics of high carbon and silicon content, high sulfur and phosphorus content, and it is difficult to adopt melting welding; However, friction welding is an excellent solid state connection...
From the casting process of nodular iron rings in the above countries, the main process methods abroad are double piece ellipse, four piece ellipse and elliptical cylinder casting process. These three casting processes have their own characteristics and are currently applied in mass production. The main processes in China...
At present, the main domestic manufacturers of nodular cast iron piston rings for automotive diesel engines, mini cars and motorcycles include Nanjing piston ring factory, Nanping auto parts factory, Fujian east Asia Machinery Co., Ltd Taoyuan Sanli Piston Ring Co., Ltd., Wuxi Mengyuan Casting Co., Ltd., etc. There are...
When the Volga car factory was built in toruyaqi, Russia in 1987, a piston ring branch factory was built in order to solve the matching problem of piston rings for 600000 cars per year. In order to improve the manufacturing technology level of nodular cast iron piston rings, a...