基于3D打印的离心泵叶轮压蜡模具快速制造工艺研究

Rapid wax injection mold manufacturing process of centrifugal pump impeller based on 3D printing technology

针对精铸行业中复杂形状压蜡模具难以快速制造问题,以开式离心泵叶轮为应用范例,开展了基于3D打印技术的压蜡模具快速制造工艺研究。首先基于Pro/E软件依次建立了叶轮模型、创建工件、创建分型曲面、抽取模具元件并进行了优化设计,然后将该模具模型导入RPData软件进行了前处理,再导入激光快速成型机直接3D打印成形,得到了树脂模具,将该树脂模具后处理后再在其内部填充金属树脂混合物,得到了金属树脂模具,最后以该金属树脂模具进行了压蜡,即制得了离心泵叶轮蜡模。研究结果表明,该快速压蜡模具压制的叶轮蜡模的尺寸精度可达0.1 mm,表面粗糙度可达Ra6.3μm。

Aiming at the problem that wax injection mold with complex shape can not be rapid manufactured in precision casting industry,a rapid wax injection mold manufacturing process based on the 3D printing technology was studied,with an unshrouded centrifugal pump impeller as the application example. Firstly the impeller model was established,the workpiece and the parting surface were created,and the mold models were created and optimized in turn by Pro / E. Secondly the mold models were pre-processed by RPData. The resin molds were directly produced by the 3D printer with the imported models. Then the metal resin molds were produced by filling metal resin mixture into the inside of the resin molds after post-processing. Finally the centrifugal pump impeller wax models were produced by injecting the wax material into the metal resin molds. The results indicate that the dimensional accuracy of the wax models can reach 0. 1 mm and the surface roughness can reach Ra6. 3 μm.