垂直缝隙式浇注系统凝固特性的数值模拟

Numerical Simulation on Solidification Characteristics of Vertical Slot Gating System

基于数值模拟技术,分析了垂直缝隙式浇注系统对平板铸件凝固过程的影响,研究了冷铁、冒口与之配合使用时铸件的凝固规律。结果表明,缝隙式浇注系统对凝固过程中铸件的横向温度场影响显著,可在有限范围内实现横向的顺序凝固。但此类浇注系统对铸件纵向温度场的影响不明显,仅通过浇注系统难以调整铸件的凝固顺序。通过配合使用冷铁和冒口,可使铸件的横向和纵向均产生较大的温度梯度,可有效控制铸件的凝固过程,改善补缩效果,提高铸件致密性。

By means of numerical simulation technique, the effects of the vertical slot gating system on solidification process of plate casting were investigated. The experimental results show that the slot gating system has great influence on the horizontal temperature distribution of the casting and the directional solidification can be achieved within a limited scope. However, this kind of gating system cannot influence the longitudinal temperature distribution obviously, and it is difficult to regulate the solidification sequence in vertical direction simply by the slot gating system. The experiment also proves that, due to the assistance of chill and riser, the slot gating system can work more efficiently because of the large vertical and horizontal temperature gradient in the casting, which is helpful to the improvement of feeding and the obtainment of compact component.