Yang Haoqin, Shan Zhongde, Yan Dandan, Shi Jianpei, Liu Qinjiang
Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
Heliyon. 2023 Aug 19;9(8):e19340. doi: 10.1016/j.heliyon.2023.e19340. eCollection 2023 Aug.
In order to promote the green and sustainable development of the foundry industry, it is necessary to further explore new methods and technologies for green foundry. This paper innovatively proposes a method of additive manufacturing of frozen sand mold, using water as the binder instead of resin binders for additive manufacturing in low-temperature environments, which effectively solves the problems of harmful gas emissions during the pouring process and the difficulty of direct recycling of molding sand, and realizes high-performance green casting of complex castings. In this paper, the liquid-solid phase transition mechanism of the binder for additive manufacturing of frozen sand mold and the change law of the normal temperature field and phase transition field of the pre-cooled powder bed porous medium at different temperatures are studied, and the process window of additive manufacturing of frozen sand mold is obtained, which provides a new green casting method for the foundry field.
为促进铸造行业的绿色可持续发展，有必要进一步探索绿色铸造的新方法和新技术。本文创新性地提出了一种冷冻砂型增材制造方法，在低温环境下用水作为粘结剂替代树脂粘结剂进行增材制造，有效解决了浇注过程中有害气体排放以及型砂直接回收困难的问题，实现了复杂铸件的高性能绿色铸造。本文研究了冷冻砂型增材制造粘结剂的液固相变机理以及不同温度下预冷粉末床多孔介质常温场和相变场的变化规律，得到了冷冻砂型增材制造的工艺窗口，为铸造领域提供了一种新的绿色铸造方法。
