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采用有限元法模拟LNGT72磁钢定向凝固过程的瞬态温度场,分析钢水浇注温度、热流密度和铸型烘烤温度对凝固前沿温度梯度(G)与凝固速度(R)比值的影响。结果表明:钢水浇注温度对G/R值影响最显著;在各种条件下,G/R值在凝固初期都呈跳跃性增长,当凝固厚度生长到5～6cm时,该值迅速下降且趋于重叠。模拟结果为LNGT72磁钢定向凝固工艺优化提供了依据。
The transient temperature field in LNGT72 directionally solidified process was simulated by finite element method. The effect of pouring temperature, heat flux and mold bake temperature on the ratio of temperature gradient (G) to solidification rate (R) was analyzed. The results show that the pouring temperature of molten steel has the most significant effect on the G / R value. Under all conditions, the G / R value increases rapidly in the initial stage of solidification. When the solidified thickness grows to 5 ~ 6cm, the value of G / Overlap. The simulation results provide the basis for optimizing the directional solidification process of LNGT72 magnet.