Fused deposition modeling (FDM), which is the most popular additive manufacturing technology, is widely used in numerous fields of economy and society such as aerospace, automobile, mechanical and biomedical engineering, education and sports. As the turbo-expander wheel is one of the major components of a large oxygen plant and has the enclosed structure with 20 streamline blade grooves, they are made with plaster casting process. As its efficiency is seriously affected by the profile of blade grooves, it is important to design the optimal profile and make plaster core precisely for the enhancement of the quality of products. In this paper, we designed the optimal profile by using the fluid analysis simulation tool and showed how the mold for making the plaster core mold according to this profile could be manufactured by using FDM equipment and so product manufacture period reduced and it resulted in the cost saving.

熔融沉积建模（FDM）是最流行的增材制造技术，已广泛用于航空航天，汽车，机械和生物医学工程，教育和体育等众多经济和社会领域。由于涡轮膨胀机轮是大型制氧设备的主要组件之一，并且具有20条流线型叶片凹槽的封闭结构，因​​此它们采用石膏浇铸工艺制成。由于其效率会受到刀片凹槽轮廓的严重影响，因此设计最佳轮廓并精确制造石膏芯对于提高产品质量非常重要。在本文中，