摘要
基于MSC.Marc有限元软件建立铝板带热轧二维有限元模型,结合实验研究得到的1×××铝合金高温本构方程,采用热力耦合分析方法研究铝板带在热轧过程中的温度变化规律,并应用正交试验法分析各工艺参数对板带轧过程中总温降的影响趋势。研究结果表明:热交换系数对温降的影响最大,轧制速度的影响次之,出炉温度的影响较小,而环境温度的影响最小;随着热交换系数的增加,轧制温降也增加,当等效换热系数由20 kW/(m2.K)增大到60 kW/(m2.K)时,轧制温降由18.3℃线性递增到38.1℃;随着轧制速度的增加,轧制温降反而减小,轧制温降与轧制速度的关系也不再呈现线性规律,当轧制速度超过2 m/s以后,轧制温降变化逐渐趋于平缓;制订轧制规程时,出炉温度可选择合理范围内的较低值以降低能源损耗;而在正常的工艺停留时间下,可以忽略环境温度变化对轧制温降的影响。
A two-dimensional FEM model for aluminum plate hot rolling simulation was set up based on software MSC.Marc and the 1××× Al-alloy hyperthermia constitutive equation was obtained by experimental research. The temperature variations during strip hot rolling was analyzed by thermo-mechanical coupled analytical method. The influence of process parameters on the temperature drop during strip hot rolling was investigated using orthogonal experimental design. The simulation results show that the heat exchange coefficient＇s effect on temperature drop is the biggest, the rolling speed＇s effect the second, the tapping temperature＇s effect is small, and the environment temperature＇s effect is the least. With the increase of heat exchange coefficient, the temperature drop increases. For example, while the equivalent heat transfer Coefficient enhances from 20 kW/（m^2·K） to 60 kW/（m^2·K）, the drop increases progressively to 38.1℃ from 18.3℃. With the increase of rolling speed, the temperature drop diminishes and the relationship between the drop and the rolling speed displays the linearity relation no longer. While the rolling speed exceeds 2 m/s, the variation of heat drop gradually tends to become gentle. The tapping temperature should be at lower value for the reduction of energy when working out rolling directive rules within a rational range, the effect that environment temperature has on the temperature drop can be ignored under the condition of regular technical standing time.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第4期728-733,共6页
Journal of Central South University:Science and Technology
基金
教育部科学技术研究重点项目(106123)
关键词
热轧
铝板带
温降
模拟
hot rolling
aluminum plate
temperature drop
simulation
