Design of an innovative new extrusion system for a printing machine for ceramics

Abstract

Today, the introduction of ceramic materials in the medical eld is becoming a vital necessity because of its stable physicochemical characteristics, high biocompatibility, and good osteoconductivity. On the other hand, machining of ceramic components is di cult, owing to their extreme hardness and brittleness. Additive Manufacturing (AM) technologies are an appropriate alternative to obtain the complex shapes of implants, which can have porous structures. Thus, since the development of 3D printing, Direct Ink Writing (DIW) is one of the most promising and inexpensive techniques for shaping free-form ceramic medical components such as prostheses or dental implants from liquids or pastes. However, the assurance of performance criteria of the extrusion system for simultaneous usage becomes the major challenge for most Direct Ink Writing (DIW) platforms, for instance for printing large parts, for multi-material printing, to decrease printing time, and to increase e ciency in terms of motor usage and weight of the extruders. To address the current de ciencies, a new extrusion system is redesigned for a 3D printing machine for ceramics that is compatible with different low-cost, open-source 3D printers. The proposed extrusion model enables printing with a loader with different syringes simultaneously, without stopping the operational process while switching the syringe. Pugh concept analysis was used to select the optimum design shape. After that, the 3D CAD environment was used to combine the strength of Pugh's method and the design space. This brings a new concept into the mechanical design eld for 3D printers, which is in line with the technological trends prevalent in industry.

Effective, versatile and inexpensive extruder system for direct ink writing of high-viscosity pastes

“…The extruder can be integrated into a conventional Cartesian 3D printer, thus aiding to the spread of low cost DIW printers in materials research labs. Similar to this study, numerous researchers have proposed extruders that signi cantly reduce the price of commercial DIW devices [11][12][13][14][15]. The challenge in this case is that, in addition to cost reduction, we look for the combination in one device of the functional advantages presented separately in those works, including capacity for multiple syringe volumes and multimaterial printing, ease of assembly, compatibility with most commercial FDM printers, ow control, retraction control, and the ability to extrude inks with a wide range of viscosities.…”

Research on key technology of ultrasonic CNC machining programming of honeycomb core parts based on feature recognition

“…Xi et al [14] identified machining features using the extended adjacency matrix method, customizing typical feature machining templates, and realizing automatic programming for spacecraft cabin segment parts. Abdelilah et al [15] decoded geometric and topological information from STEP files and reconstructed machining features, defining manufacturing parameters, machining strategies, and cutting tools to achieve automated turning machining processes.…”