Leakage Reason Analysis and Prevention Measures of Cummins L Cylinder Block

An introduction was conducted to the casting construction,production conditions and defect characteristic. The defect of leakage locations was analyzed and investigated. It was considered that the shrinkage porosities in the hot spots were the main reason causing leakage in branches of the oil canal. Based on the reason analysis,the following measures were adopted:setting densener and brushing Te-powder coating at the hot spot areas to accelerate the cooling rate of these areas;keeping the carbon content as stable as possible during induction furnace melting to reduce chilling tendency of the base iron melt;using the carburizer which had been graphitizing-treated at high temperature;controlling the pouring temperature in the range of 1400~1420 ℃. The result showed,the leakage rate caused due to shrinkage porosities in branches of the oil canal was effectively decreased. The productive validation showed that the leakage-caused rejection rate was very stable.