6061铝合金半连续铸造数值模拟与工艺优化

Numerical Simulation and Process Optimization of Semi-continuous Casting 6061 Aluminum Alloy

为解决6061铝合金半连续铸造产品出现的热裂纹等缺陷问题,利用ProCAST软件,建立了φ254 mm6061铝合金圆锭的半连续铸造热-力耦合模型,结合实际工况温度场确定了可靠的边界换热条件,分析了铸造速度、铸造温度以及引锭头启动时间对温度场、应力场的影响规律。结果表明,适当降低铸造速度和铸造温度可以获得较好的温度场和应力场分布。对φ254 mm圆锭而言,铸造速度为80~84 mm/min,铸造温度介于680~690℃之间是6061铝合金半连续铸造最优的生产工艺区间。

To solve defects such as hot cracks in semi-continuous 6061 aluminum alloy casting products,a thermal-mechanical coupling model of semi-continuous casting ofφ254 mm 6061 aluminum alloy round ingot was established by using ProCAST software.The reliable boundary heat transfer conditions were determined according to the actual working conditions.The influences of casting speed,casting temperature and starting time of the dummy head on the temperature field and stress field were analysed.The results show that a better temperature field and stress field distribution can be obtained by appropriately reducing the casting speed and casting temperature.Controlling the casting speed to 80~84 mm/min and the casting temperature to 680~690℃are the optimal production process intervals for semi-continuous casting ofφ254 mm 6061 aluminum alloy round ingots.