Layered manufacturing technology allows rapid production of parts, which can be used for various engineering evaluation and analyses. For that reason, there is a need for developing an expert tool to fully implemented analyses of a CAD model at the some phases of design process. This paper introduces multi criteria decision based on intelligent advisory system. Knowledge base contains collected experts recommendations from functional, aesthetic and ergonomic field. These recommendations are improving model characteristics for its better exploitation. The ultimate goal of this expert tool is to provide the highest level of advice, depending on the limitations, such as surface quality, time production, manufacturing, assembling, or geometrical complexity. This model system should be applicable for the most CAD models. A case study with the electrical switch is carried out in order to show usefulness of application for specific problems in the layered manufacturing process in order to get better final part. The results obtained from a case study are implemented through 3D Print Technology.
Lifting table has been designed and developed through the concept of Learning Factory (LF) at the University of Mostar. The idea for lifting table design has come from the local industry needs for a lifting platform that should lift a man and/or load at a certain height. For safety reasons, design is checked under the loading using a method of finite element analysis. The paper predicts and explains methodology for structural analysis used in presented case study. Results of FEM analysis are basis for making ways and guidelines to optimize current design in order to get optimal parameters for weight, stability, capacity, mobility and layout of the lifting table.
This paper presents theoretical approach and complex experimental research which was conducted within the real production conditions of cold roll forming channel sections. The experimental investigation was focused on forming forces measuring on the rolls and the deflections of roll stands due to the forming loads. The comparison and analysis of the obtained experimental results was performed for the majority roll stands. Based on the experimental results mathematical modelling of the forming a force-roll load was performed by response surface methodology for different values of the input parameters of the process: material properties, sheet thickness, and sheet width. The defined force model and experimental research show insufficient energetic and technological utilization of the existing production line. After the conducted research in the production process a sheet thickness of up to 1.40 mm is used instead of 0.70 mm, and the utilization of the installed energy has increased from 20 % to 75 %. This is confirmed by the measured deformations of the roll stands and the energy consumption of the powered electric motor. Through realized modernization of the cold roll forming production line, 30 % higher productivity is achieved, which is a result of optimal number planning of roll forming stations and approximately the same load of all roll stands, as well as the higher flow rate of the profile sheet.
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