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针对实际情况采用传热系数修正的方法,模拟了AZ31镁合金大规格板坯(308 mm×810 mm)半连续铸造过程的稳态温度场,分析了铸造速度对板坯温度场的影响。结果表明,随着铸造速度增加,初凝壳位置下降,液穴深度增加,合理的铸造速度为30~35 mm/min。凝固过程中温度梯度绝对值的最大值出现在结晶器底端板坯与冷却水接触处。为降低液穴深度,在大规格镁合金板坯的生产中应使用分流槽或多入口的方式将高温熔体导流至横截面远端。
According to the actual situation, the steady state temperature field of semi - continuous casting of AZ31 magnesium alloy large size slab (308 mm × 810 mm) was simulated with the method of heat transfer coefficient correction. The influence of casting speed on the temperature field of slab was analyzed. The results show that as the casting speed increases, the initial condensate shell decreases and the depth of the liquid pool increases. The reasonable casting speed is 30-35 mm / min. The maximum value of the temperature gradient during solidification appears at the bottom of the mold where the slab contacts the cooling water. In order to reduce the depth of the liquid hole, a high-temperature melt should be guided to the far side of the cross-section by using a splitter slot or multiple inlets in the production of large-size magnesium alloy slabs.