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基于有限差分软件MAGMAsoft的Continuous casting模块,建立了准800 mm×2 000 mm高强韧铝合金半连铸圆锭热-力耦合的有限差分模型。分别对不同结晶器高度、引锭底盘形状,以及不同铸造速度下的温度场、应力场进行了模拟计算。综合分析了工艺条件的改变对铸锭温度场和应力场的影响规律。结果表明:结晶器高度为200 mm时,液穴深度和铸锭温度梯度较小,裂纹倾向减少;引锭盘形状为圆柱形凸底盘时,有利于降低裂纹倾向;提高铸造速度,使液穴变深,温度梯度增加,裂纹倾向增大。
Based on the finite difference software MAGMAsoft continuous casting module, a finite difference model of thermo-mechanical coupling of semi-continuous casting ingot of 800 mm × 2 000 mm high strength and toughness aluminum alloy was established. The temperature field and stress field of different mold height, shape of undercarriage and different casting speed were simulated respectively. The influence of the change of technological conditions on the temperature field and stress field of ingot was analyzed comprehensively. The results show that when the height of mold is 200 mm, the depth of liquid hole and the temperature gradient of ingot are small, and the tendency of cracks is reduced. When the shape of ingot is cylindrical, the tendency of crack is reduced, the casting speed is increased, Become deeper, the temperature gradient increases, the crack tendency increases.