高速线材轧制全程温度曲线有限元模拟

采用Deform模拟计算加热炉铸坯温度分布,并通过"黑匣子"试验验证,当加热时间为70 min时,铸坯心部与表面温差约66℃,80 min时降到15℃. 模拟计算轧制和水冷过程心部和表面温度曲线,并通过测温仪验证,得出准确的摩擦热、塑性变形热以及水冷换热系数模型. 采用Fluent模拟计算风机的风场,使用手持测风仪验证,再建立盘条搭接点温度模型,计算出风冷线上强迫对流换热、自然换热和辐射换热系数以及相变潜热,使用热成像仪测温验证. 模拟与试验结果十分吻合.

Finite element simulation of the temperature curve of wire rods during the whole process of rolling

The temperature distribution of billets in a heating furnace is simulated by Deform software and is verified by the"black box". When the heating time is 70 min the temperature difference between surface and center is about 66℃, but it reduces to 15℃ after 80 min. The core and surface temperatures of wire rods in rolling and cooling are calculated and testified by thermometric indicator, and afterwards, the accurate friction heat, plastic deformation heat and heat transfer coefficient of water cooling are obtained. The wind field of fans is computed by Fluent software and is confirmed by anemometer. A temperature model of the lapping point is built and used to calculate the forced convection, natural and radiation heat transfer coefficients and the latent heat of phase transformation on the air-cooling line, which are validated by thermal imager. All the numerical simulation results agree well with the test data.