基于ProCAST及3D打印技术的闭式叶轮快速铸造技术研究

Rapid casting of enclosed impeller based on ProCAST and 3D printing technology

针对单件小批量复杂形状零件快速制造问题,以具有复杂内部空腔结构的闭式离心泵叶轮为研究对象,开展了基于Pro CAST及3D打印技术的快速铸造技术研究。首先采用Pro/E软件建立了离心泵叶轮及其浇注系统整体数学模型,通过Pro CAST软件对该叶轮铸造工艺过程进行了数值模拟仿真,然后完成了闭式叶轮及其浇注系统整体树脂模型的3D打印,并以该树脂模型作为熔模进行了熔模精密铸造,最终制得了闭式离心泵叶轮铸件。研究结果表明,利用该快速铸造技术制得的闭式叶轮铸件的尺寸精度可达CT4级,表面粗糙度可达Ra6.3μm以下。

Aimming at rapid manufacturing of complex shape product for single and small batch, a rapid casting technology based on Pro- CAST and 3D printing technology was studied, with the enclosed centrifugal pump impeller which has complex internal cavity structure as an application example. Firstly the enclosed impeller model with gating system was established by Pro/E, secondly the numerical simulation of casting process of the enclosed impeller was made by ProCAST, and then a resin impeller model with gating system was directly produced by 3D printing technology, finally a metal enclosed centrifugal pump impeller was casted by investment casting with the resin impeller model as the fired mold. The results indicate that the dimensional accuracy of the casted metal impeller can reach CT4 level and the surface roughness can be better than Ra6.3 μm.