Mukhangaliyeva Aishabibi, Dairabayeva Damira, Perveen Asma, Talamona Didier
Department of Mechanical and Aerospace Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana 010000, Kazakhstan.
Polymers (Basel). 2023 Oct 10;15(20):4038. doi: 10.3390/polym15204038.
Rapid investment casting is a casting process in which the sacrificial patterns are fabricated using additive manufacturing techniques, making the creation of advanced designs possible. One of the popular 3D printing methods applied in rapid investment casting is stereolithography because of its high dimensional precision and surface quality. Printing parameters of the used additive manufacturing method can influence the surface quality and accuracy of the rapid investment cast geometries. Hence, this study aims to investigate the effect of stereolithography printing parameters on the dimensional accuracy and surface roughness of printed patterns and investment cast parts. Castable wax material was used to print the sacrificial patterns for casting. A small-scale prosthetic biomedical implant for total hip replacement was selected to be the benchmark model due to its practical significance. The main results indicate that the most significant stereolithography printing parameter affecting surface roughness is build angle, followed by layer thickness. The optimum parameters that minimize the surface roughness are 0.025 mm layer thickness, 0° build angle, 1.0 support density index, and across the front base orientation. As for the dimensional accuracy, the optimum stereolithography parameters are 0.025 mm layer thickness, 30° build angle, 0.6 support density index, and diagonal to the front base orientation. The optimal printing parameters to obtain superior dimensional accuracy of the cast parts are 0.05 mm layer thickness, 45° build angle, 0.8 support density index, and diagonal to the front model base orientation. With respect to the surface roughness, lower values were obtained at 0.025 mm layer thickness, 0° build angle, 1.0 support density index, and parallel to the front base orientation.
快速熔模铸造是一种铸造工艺，其中牺牲性模型采用增材制造技术制造，从而使先进设计的创建成为可能。由于其高尺寸精度和表面质量，立体光刻是快速熔模铸造中应用的一种流行的3D打印方法。所使用的增材制造方法的打印参数会影响快速熔模铸造几何形状的表面质量和精度。因此，本研究旨在研究立体光刻打印参数对打印模型和熔模铸造零件的尺寸精度和表面粗糙度的影响。使用可铸造蜡材料打印用于铸造的牺牲性模型。由于其实际意义，选择了一种用于全髋关节置换的小型假体生物医学植入物作为基准模型。主要结果表明，影响表面粗糙度的最显著的立体光刻打印参数是构建角度，其次是层厚。使表面粗糙度最小化的最佳参数是层厚0.025毫米、构建角度0°、支撑密度指数1.0以及横跨前基部方向。至于尺寸精度，最佳立体光刻参数是层厚0.025毫米、构建角度30°、支撑密度指数0.6以及与前基部方向成对角线。获得铸件卓越尺寸精度的最佳打印参数是层厚0.05毫米、构建角度45°、支撑密度指数0.8以及与前模型基部方向成对角线。关于表面粗糙度，在层厚0.025毫米、构建角度0°、支撑密度指数1.0以及与前基部方向平行时获得较低的值。
