聚合物板材再加热过程温度分布的热电模型的研究.pdfVIP

聚合物板材再加热过程温度分布的热电模型研究 邹恒 （昆明理工大学信息工程与自动化学院，云南 昆明，650050） 摘要：在热成型工艺中，聚合物板材再加热过程中的温度分布直接影响到成品的质量。影响板材 温度分布的因素很多，最主要的是三种热量传递方式：即热传导，对流传热和辐射换热。本文基 于三种传热方式，通过寻找电系统与热系统间的相似特性，利用热电模拟方法研究再加热过程中 聚合物板材的温度分布。以PVC板材为例，利用软件EWB对该模型进行仿真，并对仿真结果进行 分析比较，得到了板材温度分布的影响因素，与实际板材加热时温度分布结果一致。 关键字：聚合物板材；温度分布；热电模型；EWB；仿真 中图分类号：TP15 文献标识码：A Electro-Thermal Model of Temperature Distribution during Polymer Sheet Reheat Phase Zouheng (FacultyofInformationEngineeringandAutomation,KunmingUniversityof ScienceandTechnology,Kunming650051,China) Abstract: Temperature distribution during polymer sheet reheat phase in thermoforming is the focus of this work, which has a direct influence in quality of the final product. There are many factors that affect temperature distribution of polymer sheet, but the main factors is the three ways of heat transferring, which are conduction, convection, and radiation. This objective of this thesis is to find the analogy between electrical and thermal quantities in the form of electro-thermal models based on the three ways of heat transferring for temperature distribution during the sheet reheat phase. The sheet model is emulated by the software of EWB based on PVC(polyvinyl chloride) samples. Through analyzing the simulation results, the factors that affects the temperature distribution is obtained and a better theoretical agreement with actual sheet is achieved. Key words: Polymer sheet, Temperature distribution, Electro-thermal model，EWB, Simulation 1．引言 平板厚度。则有 （2）式： 在热成型工艺中，聚合物板材再加热过 【6】 程中的温度分布直接影响到成品质量 。每 种板材都有其成型的最低温度，如果片材温 度过低则板材成型出来的成品达不到相应 硬度，质量会大大降低；温度过高则极有可 能使材料质地恶化甚至烧焦，产生废品；若 加热速率太快则会造成分子变性和