注蜡过程数值模拟蜡料性能的研究

Properties of Wax for Simulating Wax Injection Process

以高分子材料的流动和凝固理论为基础的数值模拟技术是研究熔模铸造过程中蜡模制备的重要方法。通过研究试验测定了蜡料的基本性能参数。首先,应用毛细管流变仪测试了蜡料的流变性能,Cross-WLF粘度模型拟合了粘度模型参数;其次,用Netzsch型差示扫描量热仪对蜡料的热性能进行了分析;最后,用间接热膨胀分析仪测试了蜡料的PVT特性。通过蜡料热性能、流变性能及其熔体可压缩性能的研究,可实现对注蜡成型过程的数值模拟,为提高熔模精密铸造蜡模的尺寸精度以及品质,奠定了理论基础。

Numerical simulation technology is an important method which based on the flow and solidification theory of polymer materials for investment casting process to research wax prepared.In this paper,we use experimental method to determine the basic performance parameters of wax.Firstly,use the capillary rheometer to test the rheological properties of wax with the Cross-WLF viscosity model to fit the viscosity model parameters.Secondly,the Netzsch type of differential scanning calorimeter was used to analysis the thermal properties of the wax.Finally,the indirect heat expansion analyzers was used to measure PVT properties of wax.By the performance of wax such as thermal,mechanical,rheological,compressibility,it can achieve numerical simulation during wax injection molding process,which can improve the dimensional accuracy and quality of wax pattern for investment casting,this laid a theoretical basis.