盘式螺杆微注塑机的动盘决定其塑化性能，而动盘的结构设计往往依赖经验，缺少理论依据。文章建立动盘的多物理场耦合的有限元模型，分别对不同结构参数的动盘在相同工艺参数下进行仿真研究，以塑化性能为目标，获得优化的动盘结构，进而利用金属3D打印快速加工优化的新动盘进行实验验证。分别使用聚丙烯（PP）、聚乳酸（PLA）和高密度聚乙烯（HDPE）进行注塑质量重复精度实验、拉伸实验、热力学性能实验，并对实验结果进行分析，验证了新动盘具有更好的塑化性能。结果表明：多物理场仿真可以为盘式螺杆微注塑机的动盘结构优化设计提供定量分析依据，金属3D打印为动盘的快速开发提供了技术手段。

The rotating disc of the disc-screw microinjection molding machine determines its plasticizing performance, but the structural design of the rotating disc often depends on designer's experience and lacks theoretical basis. In this study, the multiphysics coupling finite element model of the plasticizing unit with a rotating disc was established, and the rotating discs with different structural parameters were simulated under the same process parameters, aiming at plasticizing performance to obtain the optimal structure of the rotating disc. Furthermore, the new rotating disc optimized for rapid processing by metal 3D printing was used for experimental verification. Polypropylene (PP), polylactic acid (PLA) and high-density polyethylene (HDPE) were respectively used for injection mass repeatability experiments, tensile experiments and thermodynamic properties experiments. The experimental results were analyzed to verify that the new rotating disc had better plasticizing properties. The results show that the multiphysical field simulation can provide quantitative analysis basis for the optimal design of the rotating disc structure of the disc-screw microinjection molding machine, and the metal 3D printing can provide technical means for the rapid development of the rotating disc.