灰铸铁缸盖三维数字化硬度数据的建立

3D Hardness Data Establishment of Gray Iron Cylinder Head

通过对实际浇注的灰铸铁缸盖铸件进行切片处理并实际测量,获得了缸盖铸件的大量硬度数据;基于该实测数据和国内外学者的理论模型,建立了适合发动机缸盖硬度数据计算的数学模型：HB=186.001-12.783R＋7.444R2,式中R为铸件在1 100~1 000℃的冷却速度,适用范围为1.5~2.2℃/s;由于此模型仅考虑了冷却速度对硬度的影响,借助华铸CAE对缸盖铸件凝固过程进行了数值模拟分析,获得了铸件的冷却速率,进而建立了发动机缸盖灰铁铸件三维数字化硬度数据。

A large numbers of hardness data of cylinder head was obtained by slicing the actually cast cylinder head and conducting practical hardness test. Based on obtained hardness data and the theoretical models proposed by Chinese and foreign scholars,a mathematical model suitable to calculate the hardness data of cylinder head was established as follows： HB=186.001-12.783R＋7.444R2,where R is the cooling rate of casting in the temperature range of 1 100-1 000 ℃,its usable range is 1.5-2.20 ℃/s. Since this model only considered the influence of cooling rate on the hardness, therefore, by using the Huazhu CAE software to conduct numeral simulation analysis of the solidification process of cylinder head, the cooling rate of the casting was obtained and thereby the 3d numeral hardness data of the engine cylinder head was established.