[en] 3D printers are being explored by many of the industrial giants and daily customers as an excellent replacement for some of the traditional, inefficient, costly and waste producing techniques of manufacturing. Although, still at a premature state of development, and being thoroughly researched upon, there is lack of data concerning the physical strength or a proper machine design development for this 3-axis automated machine. Other, while being able to create a robust machine, over-utilize the resources. In this paper, we attempt to explore how analysis of vibration using minimal equipment could refine the quality of 3D printing as well as how would one improve the design to yield best results. The study is most relevant for the online open source community e.g. RepRap, within the development in new 3d printers design. (paper)

[en] Additive manufacturing, also known as three-dimension printing (3DP) has a lot of advantages over traditional construction technology, including high building efficient, less construction wastes and greatly reduced labor. This paper presents the possibility of applying this technique to 3D printing of geopolymers and concrete. Moreover, a general overview of the research and progress of 3D printing of geopolymers and concrete in recent times was characterized. This paper also identifies the most interesting and innovative solutions in this area and highlights emerging trends to stimulate further research. (paper)

[en] The paper discusses the use of 3D digitization and additive manufacturing technologies in the field of medicine. The paper focuses on design and manufacture of an orthopedic corset. Described are the methods of designing and manufacturing of orthopedic corsets according to the individual requirements of the patient at present, and a more detailed description of the design and manufacturing process using 3D digitization and additive manufacturing. The paper introduces three variants of corset design and manufacture, with the description of the materials selected for use. The main purpose of the paper is to describe the process of the effective design and manufacture of orthopedic corset using 3D digitization and additive manufacturing technologies. (paper)

[en] Highlights: • A design method is developed for graded lattice structures. • Geometries of global structure, lattice meso-structures and their spatial layout are optimized. • Experimental testing shows 24% improved stiffness of optimized graded lattice structures than uniform ones. Additive manufacturing (AM) enables fabrication of multiscale cellular structures as a whole part, whose features can span several dimensional scales. Both the configurations and layout pattern of the cellular lattices have great impact on the overall performance of the lattice structure. In this paper, we propose a novel design method to optimize cellular lattice structures to be fabricated by AM. The method enables an optimized load-bearing solution through optimization of geometries of global structures and downscale mesostructures, as well as global distributions of spatially-varying graded mesostructures. A shape metamorphosis technology is incorporated to construct the graded mesostructures with essential interconnections. Experimental testing is undertaken to verify the superior stiffness properties of the optimized graded lattice structure compared to the baseline design with uniform mesostructures.

[en] A software package for the automatic layout of printed circuit boards is presented. The program permits an interaction of the user during the layout process. The automatic searching of paths can be interrupted at any step and convenient corrections can be inserted. This procedure improves strongly the performance of the program as far as the number of unresolved connections is concerned

[en] In this paper, a new algorithm for direct slicing of triangular facet grouping slices based on STL model in rapid prototyping is proposed. A triangular facet matrix is created by reading the binary format information of the STL model. Firstly, the binary search algorithm is used to search the triangular facet intersecting with the slice plane, and the grouping matrix is established. Then according to the slice plane intersecting with the triangular plane, the intersection line segment is obtained. Finally, the depth-first search algorithm is used to optimize the contour lines with different heights. The algorithm reduces the judgment of the position relationship between the slice plane and the triangular facet and avoids the establishment of the topological information relationship between the triangular facets. It has obvious advantage in slice time. (paper)

[en] The variation and uncertainty existed in every process and considered as an essential element in precise, accurate and high-quality manufacturing, especially in the Industry 4.0 era. Manufacturing quality and reliability is affected by variations and uncertainties in different process parameters and influencing factors. The variations and uncertainties are considered very critical in measurement and monitoring process, i.e., prediction or prognostics. These variations and subsequent uncertainties are needed to be identified, quantified, analyzed and controlled. This paper presents an approach to uncertainty measurement and analysis in manufacturing. The key characteristic parameter is identified which is critical for final product quality and reliability. To determine the uncertainty in the specific parameter, the uncertainty factors of both the manufacturing process and measurement process are determined. The combined uncertainty is determined by considering the influencing factors both in manufacturing and measurement process. The relation of each factor to the key parameter is analyzed and the sensitivity coefficient is determined mathematically or experimentally. The combined and expanded uncertainty is determined considering all related factors. The proposed approach has been applied to an additive manufacturing technique, and useful results are achieved. (paper)

[en] Fabrication of printed circuit boards (PCBs) in high-radiation areas requires new technologies. The CMS detector in the CERN Large Hadron Collider will have portions in high-radiation environment. The preshower detector in front of the endcap electromagnetic calorimeter is such an area. During the past several years, the emphasis has been put on the research and development of individual components of the preshower detector. Several prototypes of PCBs were manufactured on ceramic substrates. The final prototype was a high-quality product with the ceramic board meeting all specifications, including the adherence of metallic pastes, the resistivity of the metallic lines and the precision of the laser cutting. The Yerevan Physics Institute in collaboration with the MARS Factory, Rubin L. Tech. JSC and Yerevan Telecommunication Research Institute made 4.500 units of the ceramics PCBs and are now being incorporated in the preshower detector. This article describes in detail the R and D for the technology of thick film printing on a ceramic substrate with different pastes and the precise cutting of ceramic plates by a laser

[en] We present an approach to learn about electricity and dc electric circuits by using real representational models based on the gravitational analogy. The additively manufactured models are deployed in a small-scale teaching intervention on electric potential and voltage in simple electric circuits. From the preliminary results considerable learning gains can be inferred. (paper)

[en] Efforts were undertaken to study and select fabrication methods suitable for processing multiple hybrid microcircuits (HMCs) on 3.75- by 4.5-in. (95 by 114 mm) substrates through thin-film metallization and photolithography. Each fabrication method studied was based on its potential for multiple hybrid microcircuit processing. Thin-film deposition parameters were analyzed in terms of thin-film properties necessary to meet HMC electrical and component attachment requirements, and photolithography parameters were analyzed in terms of dimensional requirements on the circuit pattern. The objective of this effort was met, and the techniques developed are being used successfully in the production of multiple HMCs