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为有效利用冷坩埚,更优控制工艺参数,获得良好冶金质量的铸棒,计算了冷坩埚连续熔铸与定向凝固Ti6Al4V温度场,对冷坩埚熔凝条件下的边界条件、驼峰和运动单元作相应处理.计算结果表明:在52kW,抽拉速度为1.2、3、4.8、6mm/min时,随抽拉速度增加,送料棒熔化量减小,驼峰过热度变小,凝固界面位置下移,形状变凹;抽拉速度为1.2mm/min时为平凝固界面.在抽拉速度为3mm/min,功率为44、48、52kW和56kW时,随功率增大,送料棒熔化区域变大且过热度增加,驼峰体积增大且过热度增加,凝固界面位置下移,形状变凹;48kW时为平凝固界面.工艺参数对凝固界面的影响计算结果与实验结果基本一致.
In order to make effective use of cold crucible, better control of the process parameters and good quality of metallurgical cast rods, the temperature field of continuous crucible casting and directional solidification of Ti6Al4V was calculated, and the boundary conditions, hump and motion unit were simulated in the cold crucible The results show that with the drawing speed of 1.2, 3, 4.8 and 6mm / min at 52kW, with the increase of drawing speed, the melting amount of the feed rod decreases, the superheat degree of the hump becomes smaller, the position of the solidification interface moves down, Becomes concave when the drawing speed is 1.2mm / min.When the drawing speed is 3mm / min, the power is 44,48,52kW and 56kW, the melting area of the feed rod becomes larger and larger as the power increases The temperature increases, the volume of hump increases and the superheat increases, the position of solidification interface moves downward, the shape becomes concave, and the interface is flat and solid at 48kW.The calculation results of the influence of process parameters on the solidification interface are basically consistent with the experimental results.