球铁曲轴铸造过程的数值模拟及分析

利用计算机数值模拟技术对某发动机球铁曲轴铸件的铸造充型过程和温度场分布进行了数值模拟,并根据传热学原理和铸造凝固理论对模拟结果进行了分析,确定了曲轴产生“缩凹”缺陷的主要原因。结合壳型填铁丸铸造工艺和球铁的凝固特点对原铸造工艺的浇注系统进行了改进,并对改进后的铸造工艺进行了计算机数值模拟和试验验证。结果表明,改进后的浇注系统补缩能力明显增强,消除了原工艺的铸造缺陷;模拟结果与实际浇注结果基本一致。

The Numeric Value Simulation and Analysis of Foundry Process of Nodular Graphite Cast Iron

Apply computer numeric value simulation technology to simulate foundry mould-filling process and distribution of temperature field of an engine nodular graphite cast iron crankshaft,and analyze the simulation results according to heat transfer principle and foundry solidification theory,determine the main reason of"puncture"defect that created in the crankshaft.Combine with the foundry technology of shell mould filling iron shot and solidification characteristics of nodular iron,improve the pouring system of former foundry technology,computer numeric value simulation and test verification are carried out for the improved foundry technology.The results show that the mending"puncture"capability of improved pouring system is enhanced obviously,the foundry defects of the former technology are eliminated;the simulation result and actual pouring result are basically identical.