Controlling process parameters of lost foam casting (LFC) enables this process to produce defect-free complex shape castings. An experimental investigation on lost foam casting of an A1-Si-Cu cast alloy was carried ...Controlling process parameters of lost foam casting (LFC) enables this process to produce defect-free complex shape castings. An experimental investigation on lost foam casting of an A1-Si-Cu cast alloy was carried out. The effects of pouting temperature, slurry viscosity, vibration time and sand size on surface finish, shrinkage porosity and eutectic silicon spacing of thin-wall casting were investigated. A full two-level factorial design of experimental technique was used to identify the significant manufacturing factors affecting the properties of casting. Pouring temperature was found as the most significant factor affecting A1-Si-Cu lost foam casting quality. It was shown that flask vibration time interacted with pouring temperature influenced euteetic silicon spacing and porosity percentage significantly. The results also revealed that the surface quality of the samples cast in fine sand moulds at higher pouring temperatures was almost unchanged, while those cast in coarse sand moulds possessed lower surface qualities. Furthermore, variation in slurry viscosity showed no significant effect on the evaluated properties compared to other parameters.展开更多
本研究旨在以全因子实验设计(design of experiment,DoE)为核心,建立黏结剂喷射型3D打印的关键工艺设计空间,通过Minitab软件设计了三因素两水平三个中心点的实验方案,分析显著影响片剂质量属性的因子及因子之间的交互作用。其次,利用...本研究旨在以全因子实验设计(design of experiment,DoE)为核心,建立黏结剂喷射型3D打印的关键工艺设计空间,通过Minitab软件设计了三因素两水平三个中心点的实验方案,分析显著影响片剂质量属性的因子及因子之间的交互作用。其次,利用计算机辅助软件(computer aided drafting,CAD)在固定模型半径与高度比值(r/h=1.25)的前提下,对模型体积大小进行调整,建立模型体积与剂量的线性回归方程,从而实现药物剂量的灵活可控。最终确定工艺参数:喷墨量为12、层厚为150μm、打印头在X轴方向运行速度为635 mm·s^(-1)。含药量(y)与模型体积(x)的回归方程:y=0.062 x-0.5827(R^(2)=0.9999),线性关系良好。结果说明,通过DoE获得了稳健可行的工艺参数且实现了不同剂量片剂的精确制备,重现性良好。展开更多
基金the Ministry of Higher Education of Malaysia (MOHE) for the financial support under the vote GUP-Q.J130000.2501.04H18
文摘Controlling process parameters of lost foam casting (LFC) enables this process to produce defect-free complex shape castings. An experimental investigation on lost foam casting of an A1-Si-Cu cast alloy was carried out. The effects of pouting temperature, slurry viscosity, vibration time and sand size on surface finish, shrinkage porosity and eutectic silicon spacing of thin-wall casting were investigated. A full two-level factorial design of experimental technique was used to identify the significant manufacturing factors affecting the properties of casting. Pouring temperature was found as the most significant factor affecting A1-Si-Cu lost foam casting quality. It was shown that flask vibration time interacted with pouring temperature influenced euteetic silicon spacing and porosity percentage significantly. The results also revealed that the surface quality of the samples cast in fine sand moulds at higher pouring temperatures was almost unchanged, while those cast in coarse sand moulds possessed lower surface qualities. Furthermore, variation in slurry viscosity showed no significant effect on the evaluated properties compared to other parameters.