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The forming principles and characteristics of additive manufacturing technology are introduced at first stage , afterwards the development status and development trend at china and abroad are studied. Tthis study points out that China's research on additive manufacturing in order to improve molding accuracy and efficiency, and expanding the applica...
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Metal additive manufacturing (AM) is a low-cost, high-efficiency functional mold manufacturing technology. However, when the functional section of the mold or part is not a partial area, and large-area additive processing of high-hardness metal is required, cracks occur frequently in AM and substrate materials owing to thermal stress and the accumu...
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FDM technology also known as a fused deposition technology is a solid based 3D printing techniques used to create prototypes and working models. It mainly uses PLA and ABS as the printing material. For the experimentation purpose, we printed two bushes, with PLA as the printing material but changing the process parameters for both the prints. The CAD model of the bush was drafted in Solidworks Software and the slicing process of the model for printing purpose was performed in Cura
Software which is compatible with Ultimaker 3D printers. The main objective was to print a bush with same material but different process parameters and compare the results obtained.
The article considers the solution of the urgent problem of creating a micro-sized turbojet engine
using 3D printing. The article describes one of the ways to cool the walls of the heat pipe of a small
combustion chamber made of heat-resistant material 08KhN53BMTYu. One of the acceptable ways to
cool the walls of a small-sized chamber heat pipe is convective heat exchange of the outer side of the
heat pipe due to intense vortex formation in the boundary layer of the flow. This effect is achieved by
the device of projections on the outer wall of the heat pipe. The article highlights the peculiarity of the
shape of the protrusions, which must be carried out taking into account the technological limitations of
3D printing. The article presents a description of an experimental stand for the study of the thermal state
of the heat pipe of micro turbojet engines, the method of processing experimental data and the results
of experiments on the heat transfer of the heat pipe shell with and without them.
Shape memory polymers are smart materials that produce shape changes under external stimulus conditions. Four-dimensional (4D) printing is a comprehensive technology originate from deformable materials and three-dimensional (3D) printing technology. At present, 4D printed shape memory polymers and shape-changing structures have been applied in various fields, especially in the field of biomedical science. 4D printing technology has made a breakthrough of personalized customization in the traditional medical field, providing a new direction for the further development of the biomedical field. In this review, the recent research and development of shape memory polymer, 3D printing technology, 4D printed shape memory polymers and shape-changing structures in biomedical area are present. The examples and applications of 4D printed shape memory polymers and their structures in the area of biomedical are also introduced. Based on 4D printing, stimulated by different conditions, 3D printed objects can be fabricated into various biomedical applications such as cell scaffolds, vascular stents, bone scaffolds, tracheal stents and cardiac stents by different 3D printing techniques. Finally, the application prospects, existing technical restriction and future development directions of 4D printed shape memory polymers and their structures in the biomedical field are summarized.
