The forged crankshaft is a very important part of the engine during operation. When used, the crankshaft mainly receives the force from the connecting rod, and then effectively converts it into a torque output through the crankshaft and drives other accessories on the engine to work. .
Forging crankshaft to a certain extent will be affected by the centrifugal force of its rotating mass, as well as the combined effect of periodic inertial force and reciprocating inertial force, so that the crankshaft can withstand bending torsion load. Therefore, the crankshaft is required to have sufficient strength and rigidity, and the journal surface needs to be wear-resistant, work evenly, and have good balance.
Smelting of forged crankshaft
The availability of high-temperature, low-sulfur pure molten iron is the key to producing high-quality nodular cast iron. At the time of production, its domestic production facilities are mainly cupola furnaces, and the hot metal is not pre-desulfurized; followed by high purity pig iron and poor coke quality. The cupola melts the molten iron, desulfurizes the furnace, and then heats up and adjusts the composition in an induction furnace. In the domestic detection of hot metal components has been commonly used vacuum direct reading spectrometer to carry out.
Forging the crankshaft
The impact modeling process of air flow is obviously superior to the clay sand process, so that it can effectively obtain a crankshaft casting with higher precision to a certain extent. The sand mold produced by this process has the characteristics of no rebound deformation, etc. The crankshaft is particularly important. In China, some crankshaft manufacturers have introduced air impact styling technology from Germany, Italy, Spain, etc. However, only a few manufacturers have introduced the entire production line.