【摘要】 自由表面的确定是铸造充型过程流场模拟的主要困难之一,没有明确的自由表面形状和位置,就不能施加边界条件,更无从谈起对流量的计算。本文首先提出了一种三维自由表面处理技术。另外,由于铁水的浇注工艺难以严格控制,且热电偶存在滞后现象,所以用铁水进行充型过程的实验验证难度较大。针对这种情况,作者采用顶注、底注及侧注三种不同形式的浇注系统重复进行了大量水力学实验验证,模拟结果与实验结果吻合较好。最后,对实际生产中的铸件进行了充型模拟。更多还原

【Abstract】 One of the main problems in filling process simulation of castings is to determine the free surface. Neither the boundary condition could be applied, nor the flux be calculated if the shape and position of free surface were uncertain. So a new method to process free surface was put forward firstly. In addition, it is rather difficult to verify the simulation result by experiments with liquid iron, owing to the unstable pouring technology and stagnant of thermocouples. As a result, a lot of well - controlled hydraulic experiments were made with diffferent pouring systems. The simulation results coincide well with the experimental ones. Finally, the filling process of a casting in practical use was calculated.更多还原