基于生死单元法的聚醚醚酮熔融沉积成型温度场仿真及分析
Simulation and Analysis of Temperature Field of Melting Formation Based on Life and Death Unit Method

聚醚醚酮(PEEK)作为高性能聚合物的一种，具有良好的塑性性能，其优良的物理性能广泛应用于航空航天领域、汽车制造业、电子信息产业、工业领域和医疗领域等。熔融沉积成型技术(FDM)为PEEK材料的主要加工方式之一，具有材料利用率高、成型效率高、制造成本低并且可以实现复杂零件成型的优势。而FDM成型PEEK过程中，由于温度场和热应力耦合场的影响，导致成型件产生变形，严重影响产品的尺寸精度和力学性能，甚至使其报废。本文基于有限元分析理论，利用生死单元法，建立FDM打印模型并进行温度场仿真，在FDM成型过程中，喷头温度对其具有一定影响，通过有限元的方法模拟仿真打印过程，分析模型不同时刻的温度场分布、不同节点的温度–时间变化曲线和温度梯度的变化趋势，得出不同喷头温度的影响规律，用以指导实际生产生活，对产品的加工有着重要的意义。
As a kind of high-performance polymer, PEEK has good plastic properties, and its excellent physical properties are widely used in aerospace field, automobile manufacturing industry, electronic information industry, industry field and medical field. Melt deposition molding technology (FDM) is one of the main processing methods of PEEK materials, which has the advantages of high material utilization rate, high molding efficiency, low manufacturing cost and can achieve complex parts molding. In the process of FDM molding PEEK, due to the influence of temperature field and thermal stress coupling field, the molding parts have deformation, which seriously affects the dimensional accuracy and mechanical properties of the product, and even makes them scrapped. Based on the finite element analysis theory, this paper uses the birth and death element method to establish an FDM printing model and conduct temperature field simulation. During the FDM forming process, the nozzle temperature has a certain influence on it. By simulating the printing process through the finite element method, the temperature field distribution at different times of the model, the temperature-time variation curves of different nodes, and the changing trend of the temperature gradient are analyzed. The influence laws of different nozzle temperatures are obtained, which can guide actual production and life and have important significance for the processing of products.