18PA6B sand casting diesel generator sets are widely used in domestic nuclear power plants, such as CNNC Jiangsu Tianwan nuclear power station and CGN Yangjiang nuclear power station. The sand casting diesel engine in the unit is designed by SEMT. PIELSTICK and manufactured by domestic enterprises. Main parameters of sand casting diesel engine: overall dimension 6711x2290x2931mm, net weight 90t, V-shaped 18 cylinder, rated speed 1000r / min, rated power 6500kw. The sand casting diesel engine adopts double turbo charging and Intercooled air intake, which can be started quickly in single and double rows, and has simple structure and is convenient for maintenance.
The crankcase is the core component of the sand casting diesel engine. See the figure for its appearance. The crankcase is the “carrier” of the sand casting diesel engine. All parts of the sand casting diesel engine are installed inside or above the crankcase. During the operation of the equipment, the crankcase bears both mechanical stress and thermal stress, and the nuclear power station requires the unit to reach the rated speed within 10s, which puts forward higher requirements for the manufacturing quality of the crankcase. In addition, if the quality control of crankcase production is not good, it will affect the stable operation of the sand casting diesel engine in the later stage, and will bury hidden dangers for the safety of the unit.
The crankcase of 18PA6B sand casting diesel engine is made by combining casting and machining. Casting is the basis of crankcase manufacturing. In addition to the particularity of casting process, special attention should be paid to quality control during production.