铸件变形是消失模铸造最常见的缺陷之一 人们在一定的控制条件下，在工艺方面对它进行大量的应用性研究 铸件变形影响因素包括模型、浇注工艺以及冷却时间等，其中模型是主要影响因素，它的变形导致铸件变形约占 ８０％ 左右，因此对模型的变形研究具有重要的现实意义 模型（ Ｅ Ｐ Ｓ）材料是属于高分子多孔性材料，在消失模铸造模型成型、涂料涂挂、造型过程中，在力的作用下可能发生变形 运用流变学理论与研究方法，利用自制的蠕变性能与应力松弛测定仪，对不同密度（００１６，００１８，０．０２９ ｇ／ｃｍ ３ ）、不同温度（２０，３０，５０ ℃）、涂挂涂料以及未涂挂涂料的 Ｅ Ｐ Ｓ模型进行了流变性能的测定，建立相应的应力应变的本构方程 研究发现， Ｅ Ｐ Ｓ的流变性能具有五元件模型： Ｅ Ｐ Ｓ＝ （ Ｈ－ Ｎ）－ （（ Ｈ｜ Ｎ）｜ Ｓ）＝ Ｍ － （ Ｋ｜ Ｓ））， Ｍ：麦克斯韦体， Ｋ：开尔芬体， Ｓ：圣维南体 不同工艺条件如密度、温度以及涂料将影响流变模型各参数的大小，从而使 Ｅ Ｐ Ｓ呈现不同的变形规律，揭示这些规律将为计算机模拟分析和控制铸件变形提供科学依据和力学参数  Casting deformation is one of the most common defects of EPC. People make a great deal of applied research in the aspect of technology under certain control conditions.  The influencing factors of casting deformation include model, pouring process and cooling time, etc. The model is The main influencing factors are deformation of castings, which accounts for about 80% of deformation. Therefore, it is of great practical significance to study the deformation of models. Model (E P S) is a macroporous porous material. Paint coating hanging, the process of modeling, the deformation may occur under the action of force  Rheological theory and research methods, the use of self-made creep properties and stress relaxation tester for different densities (0  016,0  018, 0.029 g / cm 3), different temperatures (20, 30, 50 ℃), coated coatings and unpainted coatings were used to determine the rheological properties and establish corresponding constitutive equations of stress and strain  The study found that rheological properties of E P S have a five-element model: E P S = (H | N) - ((H | N) | S) = M - (K | S)), M: Maxwell body, K: Kelphen body, S: Saint Venant body  Different process conditions such as density, Temperature and paint will affect the size of the parameters of the rheological model, so that E P S presents different deformation rules reveal that these laws will provide scientific basis and mechanical parameters for the computer simulation analysis and control of casting deformation 