考虑预热情况的液固挤压复合材料模具非稳态温度场分析及实验验证

Nonlinear heat transfer analysis of die during liquid-solid extruding composites considering preheating and its experimental verification

基于辐射传热原理,建立液固挤压复合材料过程模具传热的非稳态有限元模型,采用有限元分析与实验研究相结合的方法研究模具初始温度场和液固挤压过程模具温度场的传热特性,得到了模具温度场的变化趋势及其对成形过程的影响规律,并对比研究了考虑模具预热和初始模具温度场恒定的数值模拟情况。结果表明,考虑预热情况的模拟结果更加接近实际,且模拟结果与实验结果吻合较好。

The model of non-linear temperature field of the die for liquid-solid extruding composites process is established, which considers the preheating, the heat radiation and the contacting heat transfer between the die and other media. By combining the numerical analysis with experimental testing, the radiation heating and extruding process are simulated using the commercial finite element code MARC. On the basis of researching the heat transfer characteristics, the initial distribution of temperature field of the die and the effect on the shaping process are obtained. Through comparing the simulation results considering the preheating with the stationary temperature field, it concludes that the former approaches to actual forming process. The simulation results are in good agreement with experimental measurements. The research of this paper found the base for designing the technology parameters properly of liquid-solid extrusion composites process.