曲轴是柴油机的重要零件之一,有柴油机的“脊梁骨”之称。柴油机的使用寿命和可靠性在很大程度上取决于曲轴的质量。国内中小型柴油机球铁曲轴一般仅采用正火处理后使用,寿命约1000～1500小时,断轴率达0.5～2％,严重地影响柴油机的质量和使用效果。几年来,上海内燃机研究所、上 Crankshaft is one of the important parts of diesel engine, diesel engine, “the backbone of the bone,” said. The service life and reliability of a diesel engine depend largely on the quality of the crankshaft. Domestic small and medium-sized diesel ductile iron crankshaft is generally used only after normalizing treatment, with a service life of about 1000 to 1500 hours and a breakage rate of 0.5 to 2%, which seriously affects the quality and effect of the diesel engine. In recent years, Shanghai Internal Combustion Engine Research Institute, on