The studies presented in this article are based on the variation of some constructive parameters on various types of materials for a prehension system jaws. The pneumatic actuation prehension system is part of the structure of a manipulator integrated within a teaching platform for installation. In the tests, the varied parameters were the following: the type of plastic material, the way of printing on the 3D printer bed, the degree of fill (the density) and the geometric shape. The experimental tests have resulted in an optimal version of the prehension system jaws.
The main goal of the paper is to present how CAD and the simulation results of a virtual model were used to develop and adapt an educational platform to various manufacturing scenarios in an Industrial Logistics laboratory optimizing the performances in terms of productivity. Our paper is divided in two parts. The first part describes the design and development of an educational platform containing an AS/RS (automated storage/retrieval system) system and a RGV (Rail-Guided Vehicle). All the phases of the platform development are presented, starting with 3D modelling, and ending with the platform testing and its integration in a manufacturing cell. The second part demonstrates the platform performance diagnosis and optimization in different functional scenarios using material flow simulation. The problems that occurred (when the platform becomes part of different types of manufacturing architectures) are analysed using the simulation reports diagnosis and a new simulation validates the optimization solutions.
The research started from the fact that the coacervation process represents the process of formation of macromolecular aggregates after separation from the phase that takes place in a homogeneous polymer solution as a result of the addition of a non-solvent. This process is very complex, and takes place in several stages of emulsification technology. The first step of the research created a sample through an encapsulation process of complex coacervation, followed by the creation of three different samples with specific emulsification technologies. Each resulting sample and step of emulsification went through rheological analysis, including the development of evolutions of the complex viscosity, loss module and respective storage module. When we analyzed the rheological properties of each sample at different emulsification stages, we reached the conclusion that, at the moment when the polymerization reaction develops the methyl methacrylate (MMA), the loss modules of the samples were stronger than the storage modules. In this context, the emulsification technology strongly influenced the process of forming the polymethyl methacrylate (PMMA) layer over the butyl stearate particles. In addition, in order to obtain the corresponding microcapsules, it was preferable for the butyl stearate particles covered with MMA to be vigorously stirred in a short period of time, under 250 s, because after that the polymerization process of the MMA on the surface of the particles begins. When producing microcapsules, it is very important that the whole process of emulsification be accompanied by rigorous stirring.
Polylactic acid (PLA) is one of the most extensively used biodegradable aliphatic polyester produced from renewable resources, such as corn starch. Due to its qualities, PLA is a leading biomaterial for numerous applications in medicine as well as in industry, replacing conventional petrochemical - based polymers. The purpose of this paper is to highlight the mechanical properties, such as tensile stress, of pure PLA specimens in comparison with PLA based-composites, with three different added materials in PLA mass: Copper, Aluminum and Graphene, as well as the influence of filament angle deposition on these properties. In order to check if the the filling density of the specimen influences the ultimate tensile stress (UTS), three different filling percentages (60%, 80% and 100%) have been chosen in the experimental tests. In this context, the mechanical characteristics of four different filament types based on PLA material, starting from pure PLA to PLA with Aluminum, Copper or Graphene filler are compared. Understanding and controlling these parameters is essential for the successful use of PLA and PLA-based composites in different areas such as medical applications, sport equipments and light industry.These tests have been performed due to the fact there is a lack of information concerning the mechanical properties. In the scientific literature, such information is only available for expensive printing systems; for open source printers (as those used in these tests), the information is poor and for some new materials, even inexistant. According to the technical specifications, for an expensive printer the cost may exceed 3000 Euros, with a minimum layer resolution of 100 m, this type of printer can reliably reproduce many 3D objects accurately, in quiter conditions.
In today's industries, the storage of workpieces, components and final products has become an issue due to lack of storage spaces and to high storage costs. Companies are trying to find new solutions for material flow optimization in warehouses in order to obtain the best storage position of products. The main goal of the paper is to present how mathematical and virtual modelling can be applied in this particular area of industrial logistics. The first part of the paper describes a mathematical model based on the Markov chain theory used for industrial logistics applications. The second part of the paper contains case studies which demonstrate how Markov chain theory can be used for virtual material flow modelling of AS/RS (Automated storage/Retrieval system) systems in order to obtain the best storage position of products considering: available position, estimated storage time, product type, weight etc.
The paper presents the main results of a preliminary design study developed for two flexible manufacturing cells for wafer manipulation in solar panel manufacturing process. Based on the customer's specific requests, the flexible manufacturing cells have been developed for performing complex tasks, supplementary to robotic wafer's manipulation (wafer's loading / unloading), wafer's random position and orientation identification (before loading) being available as well as wafer's diagnosis / integrity checking (before and after processing in the specific manufacturing equipment) being available too.
This article aims to monitor and analyze trends in the conception domain and a structural design production of the packing for the art industry. It is a growing sector, where there are many innovations in designing solutions, materials and production technologies. The field of packaging presents an interest for seeing as one of its few sectors with an upward trend. When you opt for one product or another, our decision is based on several factors that have nothing to do with the actual quality of the product for which the structural design of a product can be tested as a concept by 3D modeling. In this article we argue the visual impact achieved by testing 3D structural design of the package before performing the prototype.
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